{"id":40902,"date":"2026-05-27T03:07:44","date_gmt":"2026-05-27T10:07:44","guid":{"rendered":"https:\/\/www.privateinternetaccess.com\/blog\/?p=40902"},"modified":"2026-08-26T07:45:30","modified_gmt":"2026-08-26T14:45:30","slug":"ip-address-classes","status":"publish","type":"post","link":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/","title":{"rendered":"\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306eIP\u30af\u30e9\u30b9\u3068\u306f\u2502\u4eca\u65e5\u306b\u304a\u3051\u308b\u91cd\u8981\u6027\u3068\u306f\uff1f"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u521d\u671f\u306e\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3067\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u540c\u58eb\u304c\u901a\u4fe1\u30c7\u30fc\u30bf\u3092\u3084\u308a\u53d6\u308a\u3067\u304d\u308b\u3088\u3046\u306b\u300cIP\uff08\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30d7\u30ed\u30c8\u30b3\u30eb\uff09\u30a2\u30c9\u30ec\u30b9\u300d\u306b\u57fa\u3065\u304f\u30b7\u30b9\u30c6\u30e0\u304c\u69cb\u7bc9\u3055\u308c\u307e\u3057\u305f\u3002\u305d\u306e\u5f8c\u3001IP\u30a2\u30c9\u30ec\u30b9\u3092\u6574\u7406\u3059\u308b\u305f\u3081\u306e\u5206\u985e\u3068\u3057\u3066\u300cIP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u300d\u3068\u547c\u3070\u308c\u308b\u3082\u306e\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u73fe\u5728\u3067\u306f\u3001\u3088\u308a\u65b0\u3057\u3044\u901a\u4fe1\u30b7\u30b9\u30c6\u30e0\u3084\u52b9\u7387\u7684\u306a\u901a\u4fe1\u898f\u683c\u304c\u5b58\u5728\u3057\u307e\u3059\u3002\u305d\u308c\u3067\u3082\u3001\u7279\u5b9a\u306e\u72b6\u6cc1\u306b\u304a\u3044\u3066\u4ee5\u524d\u3068\u540c\u3058IP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u306e\u69cb\u9020\u304c\u5f15\u304d\u7d9a\u304d\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>IP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u3068\u306f\u4f55\u306a\u306e\u304b\uff1f\u30af\u30e9\u30b9\u30d5\u30eb\u30a2\u30c9\u30ec\u30c3\u30b7\u30f3\u30b0\u3068\u3001\u3053\u308c\u306b\u4ee3\u308f\u308b\u6280\u8853\u304c\u5c0e\u5165\u3055\u308c\u305f\u7d4c\u7def\u3068\u306f\uff1f<\/strong> \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u73fe\u5728\u306eIP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u306b\u3064\u3044\u3066\u77e5\u3063\u3066\u304a\u304f\u3079\u304d\u77e5\u8b58\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<h2 id=\"h-ip\u30a2\u30c9\u30ec\u30b9\u306e\u57fa\u672c\u539f\u7406\" class=\"wp-block-heading\">IP\u30a2\u30c9\u30ec\u30b9\u306e\u57fa\u672c\u539f\u7406<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.privateinternetaccess.com\/ja\/what-is-my-ip\"><strong>IP\u30a2\u30c9\u30ec\u30b9<\/strong><\/a>\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u4e00\u610f\u306e\u6570\u5024\u8b58\u5225\u5b50\u3067\u3042\u308a\u3001\u3059\u3079\u3066\u306eWeb\u30b5\u30a4\u30c8\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u3001\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3001\u30bf\u30d6\u30ec\u30c3\u30c8\u3001\u30eb\u30fc\u30bf\u30fc\u3001\u305d\u306e\u4ed6\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3092\u4ecb\u3057\u3066\u30c7\u30fc\u30bf\u3092\u9001\u53d7\u4fe1\u3059\u308b\u3042\u3089\u3086\u308b\u6a5f\u5668\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306e\u5f53\u521d\u3001\u5e45\u5e83\u304f\u4f7f\u7528\u3055\u308c\u305fIP\u30a2\u30c9\u30ec\u30b9\u306e\u901a\u4fe1\u898f\u683c\u306f\u3001IPv4<\/strong>\uff08\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30d7\u30ed\u30c8\u30b3\u30eb\u30d0\u30fc\u30b8\u30e7\u30f34\uff09\u3067\u3057\u305f\u3002\u3053\u306e\u30b7\u30b9\u30c6\u30e0\u306f32\u30d3\u30c3\u30c8\u306e2\u9032\u5f62\u5f0f\u3092\u63a1\u7528\u3057\u3066\u304a\u308a\u3001<strong>\u7d0443\u5104\u500b\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u751f\u6210\u53ef\u80fd\u3067\u3059\u3002<sup>1<\/sup><sup><br><\/sup><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1980\u5e74\u4ee3\u306e\u6642\u70b9\u3067\u306f\u3001SNS\u3084\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u30b5\u30fc\u30d3\u30b9\u3001\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u306a\u3069\u304c\u767b\u5834\u3059\u308b\u524d\u3067\u3042\u308a\u3001<strong>IPv4\u30a2\u30c9\u30ec\u30b9\u306e\u500b\u6570\u3067\u5341\u5206\u904b\u7528\u3067\u304d\u307e\u3057\u305f\u3002<sup>2<\/sup><\/strong> \u5f53\u6642\u306f\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306e\u898f\u6a21\u3082\u6bd4\u8f03\u7684\u5c0f\u3055\u304b\u3063\u305f\u305f\u3081\u3001\u6570\u5341\u5104\u53f0\u306e\u30c7\u30d0\u30a4\u30b9\u304c\u63a5\u7d9a\u3055\u308c\u308b\u3068\u3044\u3046\u4e8b\u614b\u306f\u9060\u3044\u672a\u6765\u306e\u8a71\u3067\u3057\u304b\u306a\u304b\u3063\u305f\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3057\u304b\u3057\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306e\u666e\u53ca\u304c\u52a0\u901f\u3057\u3066\u901a\u4fe1\u7aef\u672b\u304c\u5897\u3048\u308b\u306b\u3064\u308c\u3001<strong>1980\u5e74\u4ee3\u5f8c\u534a\u304b\u30891990\u5e74\u4ee3\u521d\u982d\u306b\u304b\u3051\u3066\u3001IPv4\u30a2\u30c9\u30ec\u30b9\u306e\u67af\u6e07\u306b\u5bfe\u3059\u308b\u61f8\u5ff5\u304c\u9ad8\u307e\u308a\u59cb\u3081\u307e\u3057\u305f\u3002<\/strong>\u3053\u308c\u306b\u5bfe\u5fdc\u3059\u308b\u305f\u3081\u3001<strong>1990\u5e74\u4ee3\u306b<a href=\"#CIDR\">CIDR\uff08\u30af\u30e9\u30b9\u30ec\u30b9\u30c9\u30e1\u30a4\u30f3\u9593\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\uff09<\/a><\/strong>\u304c\u958b\u767a\u3055\u308c\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u5272\u308a\u5f53\u3066\u65b9\u6cd5\u304c\u6539\u5584\u3055\u308c\u3001\u30a2\u30c9\u30ec\u30b9\u306e\u7121\u99c4\u304c\u524a\u6e1b\u3055\u308c\u307e\u3057\u305f\u3002<sup>3<br><\/sup><strong><br>\u3053\u3046\u3057\u305f\u7bc0\u7d04\u7b56\u304c\u8b1b\u3058\u3089\u308c\u305f\u3082\u306e\u306e\u3001IPv4\u306e\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3\u306e\u9650\u754c\u306f\u307e\u3059\u307e\u3059\u6df1\u523b\u5316\u3057\u3066\u304a\u308a\u3001\u73fe\u5728\u3067\u306f\u65b0\u3057\u3044\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3042\u308bIPv6\u306e\u63a1\u7528\u30fb\u79fb\u884c\u304c\u9032\u3093\u3067\u3044\u307e\u3059\u3002<\/strong>IPv6\u306f128\u30d3\u30c3\u30c8\u306e\u30a2\u30c9\u30ec\u30b9\u4f53\u7cfb\u3092\u6301\u3061\u3001\u306f\u308b\u304b\u306b\u591a\u304f\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u63d0\u4f9b\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>IPv6\u306e\u666e\u53ca\u306f\u9032\u3093\u3067\u3044\u307e\u3059\u304c\u3001\u4eca\u65e5\u306e\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306e\u591a\u304f\u306f\u4f9d\u7136\u3068\u3057\u3066IPv4\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\u73fe\u72b6\u3067\u3042\u308b<\/strong>\u305f\u3081\u3001IPv4\u306e\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u3001\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3001\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9\u3001\u30b5\u30d6\u30cd\u30c3\u30c8\u5206\u5272\u3001\u304a\u3088\u3073\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u57fa\u672c\u3092\u7406\u89e3\u3057\u3066\u304a\u304f\u3079\u304d\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 id=\"h-ipv4\u304a\u3088\u3073ipv6\u30a2\u30c9\u30ec\u30b9\u306e\u69cb\u9020\" class=\"wp-block-heading\">IPv4\u304a\u3088\u3073IPv6\u30a2\u30c9\u30ec\u30b9\u306e\u69cb\u9020<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u3059\u3079\u3066\u306eIPv4\u30a2\u30c9\u30ec\u30b9\u306f\u300132\u30d3\u30c3\u30c8\u306e\u6570\u5024\u304c\u300c\u30aa\u30af\u30c6\u30c3\u30c8\u300d\u3068\u547c\u3070\u308c\u308b4\u3064\u306e\u533a\u9593\u306b\u5206\u5272\u3055\u308c\u305f\u3082\u306e\u3067\u3059\u3002<\/strong>\u30d4\u30ea\u30aa\u30c9\u3067\u533a\u5207\u3089\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u4e00\u76ee\u3067\u8b58\u5225\u3067\u304d\u307e\u3059\u3002\u5404\u30aa\u30af\u30c6\u30c3\u30c8\u306f8\u30d3\u30c3\u30c8\u3067\u69cb\u6210\u3055\u308c\u3066\u304a\u308a\u3001\u5024\u306f0\u304b\u3089255\u306e\u7bc4\u56f2\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u666e\u6bb5\u76ee\u306b\u3059\u308bIPv4\u30a2\u30c9\u30ec\u30b9\u306f\u3001\u300c\u5b9f\u969b\u306e\u300d2\u9032\u6570\u30a2\u30c9\u30ec\u30b9\u3092\u7c21\u7565\u5316\u3057\u3001\u4eba\u9593\u304c\u8aad\u307f\u3084\u3059\u3044\u5f62\u306b\u3057\u305f\u3082\u306e\u3067\u3059\u3002<\/strong>\u4f8b\u3048\u3070\u3001192.0.2.10\u3068\u3044\u3063\u305f\u30a2\u30c9\u30ec\u30b9\u3067\u3059\u3002\u88cf\u5074\u3067\u306f\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u306f\u3053\u306e\u30a2\u30c9\u30ec\u30b9\u30922\u9032\u6570\u5f62\u5f0f\uff0811000000.00000000.00000010.00001010\uff09\u3068\u3057\u3066\u89e3\u91c8\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5404\u30aa\u30af\u30c6\u30c3\u30c8\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3084\u30db\u30b9\u30c8\uff08\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306b\u63a5\u7d9a\u3055\u308c\u305f\u30c7\u30d0\u30a4\u30b9\uff09\u3092\u8b58\u5225\u3059\u308b\u91cd\u8981\u306a\u5f79\u5272\u3092\u62c5\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u65b9\u3001<strong>IPv6\u3067\u306f\u3001IP\u30a2\u30c9\u30ec\u30b9\u304c128\u30d3\u30c3\u30c8\u306b\u62e1\u5f35\u3055\u308c\u3001\u30b3\u30ed\u30f3\u3067\u533a\u5207\u3089\u308c\u305f16\u9032\u6570\u5f62\u5f0f<\/strong>\uff08\u4f8b\uff1a2001:db8:85a3::8a2e:370:7334\uff09\u3067\u8868\u8a18\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u62e1\u5f35\u5f62\u5f0f\u306b\u3088\u308a\u3001\u81a8\u5927\u306a\u6570\u306e\u30a2\u30c9\u30ec\u30b9\uff08\u7d04340\u30a6\u30f3\u30c7\u30b7\u30ea\u30aa\u30f3\uff09<sup>4<\/sup>\u63d0\u4f9b\u304c\u53ef\u80fd\u3068\u306a\u308a\u3001\u73fe\u4ee3\u306e\u30c7\u30d0\u30a4\u30b9\u6570\u3084\u30b9\u30de\u30fc\u30c8\u30c6\u30af\u30ce\u30ed\u30b8\u30fc\u3060\u3051\u3067\u306a\u304f\u3001\u5c06\u6765\u306e\u6210\u9577\u3084\u30c7\u30d0\u30a4\u30b9\u5897\u52a0\u3092\u652f\u3048\u3089\u308c\u308b\u7a0b\u306e\u9065\u304b\u306a\u4f59\u88d5\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IPv4\u3068IPv6\u3067\u306f\u30a2\u30c9\u30ec\u30b9\u5f62\u5f0f\u304c\u7570\u306a\u308a\u307e\u3059\u304c<strong>\u3069\u3061\u3089\u3082\u6839\u672c\u7684\u306a\u5f79\u5272\u306f\u540c\u3058\u3067\u3001<\/strong>\u30c7\u30d0\u30a4\u30b9\u304c\u76f8\u4e92\u306b\u8b58\u5225\u3057\u5408\u3044\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u4ecb\u3057\u3066\u52b9\u7387\u7684\u306b\u30c7\u30fc\u30bf\u3092\u5c4a\u3051\u308b\u5f79\u5272\u3092\u62c5\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"h-ip\u30a2\u30c9\u30ec\u30b9\u306e5\u3064\u306e\u30af\u30e9\u30b9\u3068\u306f\" class=\"wp-block-heading\">IP\u30a2\u30c9\u30ec\u30b9\u306e5\u3064\u306e\u30af\u30e9\u30b9\u3068\u306f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">IPv4\u30a2\u30c9\u30ec\u30b9\u306e\u6570\u304c\u5897\u3048\u308b\u306b\u3064\u308c\u3066\u30a2\u30c9\u30ec\u30b9\u7ba1\u7406\u304c\u56f0\u96e3\u306b\u306a\u3063\u3066\u304d\u305f\u305f\u3081\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u52b9\u7387\u5316\u3059\u308b\u305f\u3081\u3001<strong>\u300c\u30af\u30e9\u30b9\u30d5\u30eb\u30a2\u30c9\u30ec\u30c3\u30b7\u30f3\u30b0\uff08Classful Addressing\uff09\u300d\u3068\u3057\u3066\u77e5\u3089\u308c\u308b\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u4f53\u7cfb\u7684\u306a\u5206\u985e\u30b7\u30b9\u30c6\u30e0\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001IPv4\u30a2\u30c9\u30ec\u30b9\u3092<strong>5\u3064\u306e\u30af\u30e9\u30b9\u306b\u5206\u985e\u3057\u3066\u3044\u307e\u3059\u3002A\u3001B\u3001C\u30af\u30e9\u30b9\u306f\u901a\u5e38\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u901a\u4fe1\u7528\u3067\u3001D\u30af\u30e9\u30b9\u3068E\u30af\u30e9\u30b9\u306f\u7279\u5b9a\u306e\u76ee\u7684\u306e\u305f\u3081\u306b\u4e88\u7d04\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/strong>\u3053\u306e\u69cb\u9020\u306b\u3088\u308a\u3001\u30c7\u30d0\u30a4\u30b9\u306e\u6574\u7406\u3001\u30a2\u30c9\u30ec\u30b9\u7a7a\u9593\u306e\u5272\u308a\u5f53\u3066\u3001\u304a\u3088\u3073\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306e\u3088\u308a\u52b9\u7387\u7684\u306a\u8a98\u5c0e\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5404IPv4\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u306f\u3001\u30a2\u30c9\u30ec\u30b9\u7bc4\u56f2\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3068\u30db\u30b9\u30c8\u3078\u306e\u5272\u308a\u5f53\u3066\u3001\u304a\u3088\u3073\u60f3\u5b9a\u3055\u308c\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u898f\u6a21\u306a\u3069\u3001\u5272\u308a\u5f53\u3066\u7528\u9014\u304c\u56fa\u5b9a\u7684\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u3088\u3046\u306a\u5f62\u5f0f\u3092\u3057\u305f\u6570\u5024\u3067\u3042\u308a\u3001\u3069\u306e\u90e8\u5206\u304c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u6307\u3057\u3001\u3069\u306e\u90e8\u5206\u304c\u30db\u30b9\u30c8\u3092\u6307\u3059\u304b\u3092\u8b58\u5225\u3059\u308b\u5f79\u5272\u3092\u6301\u3061\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u521d\u306e\u30aa\u30af\u30c6\u30c3\u30c8\uff08\u307e\u305f\u306f\u6700\u521d\u306e\u30aa\u30af\u30c6\u30c3\u30c8\u306e\u30b0\u30eb\u30fc\u30d7\uff09\u306f\u3001\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b5\u30a4\u30ba\u3001\u304a\u3088\u3073\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3092\u5b9a\u3081\u308b\u3082\u306e\u3067\u3001\u6b8b\u308a\u306e\u30aa\u30af\u30c6\u30c3\u30c8\u306f\u30db\u30b9\u30c8\u30c7\u30d0\u30a4\u30b9\u3092\u8b58\u5225\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001<strong>IPv4\u306e\u5404\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u3068\u305d\u306e\u7bc4\u56f2\u306e\u6982\u8981\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>\u30af\u30e9\u30b9<\/strong><\/td><td><strong>\u30aa\u30af\u30c6\u30c3\u30c8\u7bc4\u56f2<\/strong><\/td><td><strong>\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af<\/strong><\/td><td><strong>\u30db\u30b9\u30c8\u306e\u6570<\/strong><\/td><td><strong>\u4e3b\u306a\u7528\u9014<\/strong><\/td><\/tr><tr><td>A\u00a0<\/td><td>1\uff5e127<\/td><td>255.0.0.0\uff088 \u30d3\u30c3\u30c8\uff09<\/td><td>\u6700\u592716,777,214\u500b<\/td><td>\u5927\u898f\u6a21\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\uff08\u65e7\u5f0f\uff09<\/td><\/tr><tr><td>B<\/td><td>128\uff5e191<\/td><td>255.255.0.0\uff0816 \u30d3\u30c3\u30c8\uff09<\/td><td>\u6700\u592765,534\u500b<\/td><td>\u4e2d\u898f\u6a21\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\uff08\u65e7\u5f0f\uff09<\/td><\/tr><tr><td>C<\/td><td>192\uff5e223<\/td><td>255.255.255.0\uff0824 \u30d3\u30c3\u30c8\uff09<\/td><td>\u6700\u5927254\u500b<\/td><td>\u5c0f\u898f\u6a21\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\uff08\u65e7\u5f0f\uff09<\/td><\/tr><tr><td>D<\/td><td>224\uff5e239<\/td><td>\u8a72\u5f53\u306a\u3057<\/td><td>\u8a72\u5f53\u306a\u3057<\/td><td>\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8<\/td><\/tr><tr><td>E<\/td><td>240\uff5e255<\/td><td>\u8a72\u5f53\u306a\u3057<\/td><td>\u8a72\u5f53\u306a\u3057<\/td><td>\u7814\u7a76\u304a\u3088\u3073\u5b9f\u9a13\u7528<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 id=\"h-ip\u30a2\u30c9\u30ec\u30b9-\u30af\u30e9\u30b9a\" class=\"wp-block-heading\">IP\u30a2\u30c9\u30ec\u30b9 \u30af\u30e9\u30b9A<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30e9\u30b9A\u306eIP\u30a2\u30c9\u30ec\u30b9\u306f\u3001<strong>\u5927\u898f\u6a21\u306a\u7d44\u7e54\u3084\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u30ec\u30d9\u30eb\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u4f7f\u7528\u3055\u308c\u3066\u304d\u307e\u3057\u305f\u3002<\/strong>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u8b58\u5225\u3059\u308b\u306e\u306f\u3001\u6570\u5024\u306e\u7bc4\u56f2\u304c1\u301c127\u307e\u3067\u306e\u6700\u521d\u306e\u30aa\u30af\u30c6\u30c3\u30c8\u3067\u3059\u3002\u6b8b\u308a\u306e\u30d3\u30c3\u30c8\u306f\u30db\u30b9\u30c8\u30c7\u30d0\u30a4\u30b9\u3092\u8b58\u5225\u3057\u3001\u5927\u898f\u6a21\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30671,670\u4e07\u53f0\u4ee5\u4e0a\u306e\u63a5\u7d9a\u30c7\u30d0\u30a4\u30b9\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<sup>5<br><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bfe\u5fdc\u30c7\u30d0\u30a4\u30b9\u6570\u304c\u591a\u3044\u305f\u3081\u3001\u5927\u4f01\u696d\u3001\u653f\u5e9c\u6a5f\u95a2\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30d0\u30c3\u30af\u30dc\u30fc\u30f3\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3001\u304a\u3088\u3073\u5927\u624b\u7d44\u7e54\u306f\u3001\u30af\u30e9\u30b9A\u306eIP\u30a2\u30c9\u30ec\u30b9\u306b\u4f9d\u5b58\u3057\u3066\u304d\u307e\u3057\u305f\u3002\u30af\u30e9\u30b9A\u30a2\u30c9\u30ec\u30b9\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u300c255.0.0.0\u300d\u3067\u3059\u3002\u30af\u30e9\u30b9A IP\u30a2\u30c9\u30ec\u30b9\u306e\u4f8b\uff1a23.45.67.89\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">IP\u30a2\u30c9\u30ec\u30b9 \u30af\u30e9\u30b9B<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30e9\u30b9B\u306eIP\u30a2\u30c9\u30ec\u30b9\u306f\u3001<strong>\u4e2d\u898f\u6a21\u304a\u3088\u3073\u5927\u898f\u6a21\u306a\u7d44\u7e54\u3067\u4f7f\u7528\u3055\u308c\u3066\u304d\u307e\u3057\u305f\u3002<\/strong>\u3053\u306e\u30af\u30e9\u30b9\u3067\u306f\u3001\u6700\u521d\u306e2\u30aa\u30af\u30c6\u30c3\u30c8\uff08\u3064\u307e\u308a\u6700\u521d\u306e16\u30d3\u30c3\u30c8\uff09\u304c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u3001\u6b8b\u308a\u306e\u30d3\u30c3\u30c8\u304c\u30db\u30b9\u30c8\u3092\u8b58\u5225\u3057\u307e\u3059\u3002\u6700\u521d\u306e\u30aa\u30af\u30c6\u30c3\u30c8\u306e\u7bc4\u56f2\u306f128\u301c191\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u69cb\u9020\u306b\u3088\u308a\u3001\u30af\u30e9\u30b9B\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306f1\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3042\u305f\u308a65,000\u53f0\u4ee5\u4e0a\u306e\u30db\u30b9\u30c8\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3068\u306a\u308a<sup>6<\/sup>\u3001\u5927\u5b66\u3001\u533b\u7642\u30b7\u30b9\u30c6\u30e0\u3001\u56fd\u5185\u306e\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30b5\u30fc\u30d3\u30b9\u30d7\u30ed\u30d0\u30a4\u30c0\uff08ISP\uff09\u3001\u304a\u3088\u3073\u30a4\u30f3\u30d5\u30e9\u9700\u8981\u304c\u62e1\u5927\u3057\u3066\u3044\u308b\u5927\u4f01\u696d\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30e9\u30b9B\u30a2\u30c9\u30ec\u30b9\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u300c255.255.0.0\u300d\u3067\u3059\u3002\u30af\u30e9\u30b9B IP\u30a2\u30c9\u30ec\u30b9\u306e\u4f8b\uff1a172.16.25.10<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">IP\u30a2\u30c9\u30ec\u30b9 \u30af\u30e9\u30b9C<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30e9\u30b9C\u306eIP\u30a2\u30c9\u30ec\u30b9\u306f\u3001<strong>\u30af\u30e9\u30b9A\u3084\u30af\u30e9\u30b9B\u304c\u63d0\u4f9b\u3059\u308b\u3088\u3046\u306a\u81a8\u5927\u306a\u30db\u30b9\u30c8\u6570\u3092\u5fc5\u8981\u3068\u3057\u306a\u3044\u3001\u5c0f\u898f\u6a21\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5411\u3051\u306b\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30e9\u30b9C\u3067\u306f\u3001\u6700\u521d\u306e3\u30aa\u30af\u30c6\u30c3\u30c8\uff0824\u30d3\u30c3\u30c8\uff09\u304c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u3001\u6700\u5f8c\u306e\u90e8\u5206\u304c\u30db\u30b9\u30c8\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u307e\u3059\u3002\u6700\u521d\u306e\u30aa\u30af\u30c6\u30c3\u30c8\u306e\u7bc4\u56f2\u306f192\u301c223\u3067\u3059\u3002\u30af\u30e9\u30b9C\u30a2\u30c9\u30ec\u30b9\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u300c255.255.255.0\u300d\u3067\u3059\u3002\u30af\u30e9\u30b9C IP\u30a2\u30c9\u30ec\u30b9\u306e\u4f8b\uff1a192.168.1.20\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">IP\u30a2\u30c9\u30ec\u30b9 \u30af\u30e9\u30b9D<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30e9\u30b9D\u306eIP\u30a2\u30c9\u30ec\u30b9\u306f<strong>\u3001\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u7528\u306b\u4e88\u7d04\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/strong>\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u3068\u306f\u3001\u9001\u4fe1\u8005\u304c\u53d7\u4fe1\u8005\u3054\u3068\u306b\u500b\u5225\u306e\u63a5\u7d9a\u3092\u78ba\u7acb\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u30011\u3064\u306e\u9001\u4fe1\u5143\u304b\u3089\u8907\u6570\u306e\u30c7\u30d0\u30a4\u30b9\u306b\u540c\u6642\u306b\u30c7\u30fc\u30bf\u3092\u914d\u4fe1\u3067\u304d\u308b\u300c\u4e00\u5bfe\u591a\u300d\u306e\u901a\u4fe1\u65b9\u5f0f\u3067\u3059\u3002<br><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u306f\u3001\u30d3\u30c7\u30aa\u4f1a\u8b70\u3001\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u3001\u30aa\u30f3\u30e9\u30a4\u30f3\u30b2\u30fc\u30e0\u3001\u30e9\u30a4\u30d6\u914d\u4fe1\u306a\u3069\u3001\u540c\u3058\u30c7\u30fc\u30bf\u3092\u4e00\u5ea6\u306b\u591a\u6570\u306e\u30c7\u30d0\u30a4\u30b9\u306b\u5c4a\u3051\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u9762\u3067\u4f7f\u308f\u308c\u307e\u3059\u3002<strong>\u30af\u30e9\u30b9A\u3001B\u3001C\u3068\u306f\u7570\u306a\u308a\u3001\u30af\u30e9\u30b9D\u306eIP\u30a2\u30c9\u30ec\u30b9\u306f\u500b\u3005\u306e\u7d44\u7e54\u3084\u30c7\u30d0\u30a4\u30b9\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u307e\u305b\u3093\u3002<\/strong>\u30af\u30e9\u30b9D\u306eIP\u30a2\u30c9\u30ec\u30b9\u306f\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u901a\u4fe1\u5c02\u7528\u306b\u4e88\u7d04\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30e9\u30b9D\u306e\u30a2\u30c9\u30ec\u30b9\u306f\u3001\u6700\u521d\u306e\u30aa\u30af\u30c6\u30c3\u30c8\u304c224\u301c239\u306e\u7bc4\u56f2\u3067\u3059\u3002\u30af\u30e9\u30b9D\u306eIP\u30a2\u30c9\u30ec\u30b9\u306e\u4f8b\uff1a224.0.0.1\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">IP\u30a2\u30c9\u30ec\u30b9 \u30af\u30e9\u30b9E<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30e9\u30b9E\u306eIP\u30a2\u30c9\u30ec\u30b9\u306f\u3001<strong>\u7814\u7a76\u3001\u5b9f\u9a13\u7684\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u69cb\u7bc9\u3001\u304a\u3088\u3073\u958b\u767a\u306e\u76ee\u7684\u306e\u305f\u3081\u306b\u4e88\u7d04\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30e9\u30b9E\u306e\u30a2\u30c9\u30ec\u30b9\u306f<strong>\u4e00\u822c\u7684\u306a\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u306f\u4f7f\u7528\u3055\u308c\u305a\u3001\u5f93\u6765\u306e\u30c7\u30d0\u30a4\u30b9\u306b\u3082\u5272\u308a\u5f53\u3066\u3089\u308c\u307e\u305b\u3093\u3002<\/strong>\u30af\u30e9\u30b9E\u306e\u30a2\u30c9\u30ec\u30b9\u306f\u3001\u30c6\u30b9\u30c8\u74b0\u5883\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5b9f\u9a13\u3001\u304a\u3088\u3073\u7814\u7a76\u65bd\u8a2d\u306e\u305f\u3081\u306b\u4e88\u7d04\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30e9\u30b9E\u30a2\u30c9\u30ec\u30b9\u306e\u6700\u521d\u306e\u30aa\u30af\u30c6\u30c3\u30c8\u306f240\u301c255\u306e\u7bc4\u56f2\u3067\u3059\u3002\u30af\u30e9\u30b9E\u306fIPv4\u30a2\u30c9\u30ec\u30b9\u69cb\u9020\u306e\u4e00\u90e8\u3067\u3042\u308b\u3082\u306e\u306e\u3001\u307b\u3068\u3093\u3069\u306e\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30e6\u30fc\u30b6\u30fc\u306f\u30af\u30e9\u30b9E\u30a2\u30c9\u30ec\u30b9\u3068\u76f4\u63a5\u95a2\u308f\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30af\u30e9\u30b9E IP\u30a2\u30c9\u30ec\u30b9\u306e\u4f8b\uff1a240.0.0.10\u3002<\/p>\n\n\n\n<h3 id=\"h-\u7279\u5225\u306aip\u30a2\u30c9\u30ec\u30b9\u3068\u4f8b\u5916\" class=\"wp-block-heading\">\u7279\u5225\u306aIP\u30a2\u30c9\u30ec\u30b9\u3068\u4f8b\u5916<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2026\/08\/JA-Special-IP-Addresses-and-Exceptions-Japanese.png\" alt=\"\u30eb\u30fc\u30d7\u30d0\u30c3\u30af\u3001\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u3001APIPA\u306eIPv4\u30a2\u30c9\u30ec\u30b9\u306b\u3064\u3044\u3066\u3001\u30b7\u30f3\u30d7\u30eb\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a2\u30a4\u30b3\u30f3\u3067\u793a\u3057\u305f\u30a4\u30f3\u30d5\u30a9\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30e9\u30b9A\u304b\u3089E\u4ee5\u5916\u306b\u3082\u3001<strong>\u7279\u5225\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u304a\u3088\u3073\u901a\u4fe1\u306e\u76ee\u7684\u3067\u4f7f\u7528\u3055\u308c\u3066\u3044\u308bIPv4\u30a2\u30c9\u30ec\u30b9\u304c\u3042\u308a\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u30eb\u30fc\u30d7\u30d0\u30c3\u30af\u30a2\u30c9\u30ec\u30b9<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>127\u306f\u672c\u6765\u306e\u30af\u30e9\u30b9A\u306e\u7bc4\u56f2\u5185\u306b\u542b\u307e\u308c\u307e\u3059\u304c\u3001127.0.0.0\/8\u306e\u30d6\u30ed\u30c3\u30af\u306f\u30eb\u30fc\u30d7\u30d0\u30c3\u30af\u304a\u3088\u3073\u30ed\u30fc\u30ab\u30eb\u30db\u30b9\u30c8\u306e\u30c6\u30b9\u30c8\u7528\u306b\u4e88\u7d04\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001<\/strong>\u4f7f\u7528\u53ef\u80fd\u306a\u30af\u30e9\u30b9A\u30a2\u30c9\u30ec\u30b9\u7bc4\u56f2\u304b\u3089\u306f\u9664\u5916\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u6700\u3082\u4e00\u822c\u7684\u306b\u4f7f\u7528\u3055\u308c\u308b\u30eb\u30fc\u30d7\u30d0\u30c3\u30af\u30a2\u30c9\u30ec\u30b9\u306f\u300c127.0.0.1\u300d\u3067\u3001\u30db\u30b9\u30c8\u540d\u3067\u306f\u300clocalhost\u300d\u3068\u3057\u3066\u77e5\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u30eb\u30fc\u30d7\u30d0\u30c3\u30af\u306e\u5168\u7bc4\u56f2\u306f\u300c127.0.0.0\u300d\u304b\u3089\u300c127.255.255.255\u300d\u307e\u3067\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u3053\u306e\u7bc4\u56f2\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30c6\u30b9\u30c8\u3001\u8a3a\u65ad\u3001\u304a\u3088\u3073\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u958b\u767a\u306e\u76ee\u7684\u3067\u81ea\u5206\u81ea\u8eab\u3078\u901a\u4fe1\u3092\u8fd4\u3057\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.privateinternetaccess.com\/blog\/private-ip-addresses\/\">\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9<\/a>\u306f\u3001\u5185\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u901a\u4fe1\u7528\u306b\u4e88\u7d04\u3055\u308c\u3066\u3044\u307e\u3059\u3002<strong>\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3092\u4ecb\u3057\u3066\u516c\u7684\u306b\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3055\u308c\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/strong>\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u756a\u53f7\u5272\u308a\u5f53\u3066\u6a5f\u95a2\uff08IANA\uff09\u306f\u3001\u30af\u30e9\u30b9A\u3001\u30af\u30e9\u30b9B\u3001\u30af\u30e9\u30b9C\u305d\u308c\u305e\u308c\u306b1\u3064\u305a\u3064\u3001\u4ee5\u4e0b\u306e\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u7bc4\u56f2\u3092\u4e88\u7d04\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>10.0.0.0\/8\uff08\u30af\u30e9\u30b9A\uff09<\/li>\n\n\n\n<li>172.16.0.0\/12\uff08\u30af\u30e9\u30b9B\uff09<\/li>\n\n\n\n<li>192.168.0.0\/16\uff08\u30af\u30e9\u30b9C\uff09<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9\u306e\u7bc4\u56f2\u306f\u3001\u5bb6\u5ead\u7528Wi-Fi\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3001\u30aa\u30d5\u30a3\u30b9\u3001\u4f01\u696d\u74b0\u5883\u3001\u30af\u30e9\u30a6\u30c9\u30a4\u30f3\u30d5\u30e9\u3001\u30eb\u30fc\u30bf\u30fc\u3001\u304a\u3088\u3073\u540c\u4e00\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u3067\u30c7\u30d0\u30a4\u30b9\u304c\u5b89\u5168\u306b\u901a\u4fe1\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u305d\u306e\u4ed6\u306e\u5185\u90e8\u30b7\u30b9\u30c6\u30e0\u9593\u3067\u5e45\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u305f\u3068\u3048\u3070\u3001\u591a\u304f\u306e\u5bb6\u5ead\u7528\u30eb\u30fc\u30bf\u30fc\u306f\u3001\u300c192.168.1.1\u300d\u3084\u300c192.168.0.1\u300d\u306a\u3069\u306e\u30ed\u30fc\u30ab\u30eb\u30c7\u30d0\u30a4\u30b9\u30a2\u30c9\u30ec\u30b9\u3092\u5272\u308a\u5f53\u3066\u3066\u304a\u308a\u3001\u3053\u308c\u306b\u3088\u308a\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3001\u30ce\u30fc\u30c8\u30d1\u30bd\u30b3\u30f3\u3001\u30d7\u30ea\u30f3\u30bf\u30fc\u3001\u30b9\u30de\u30fc\u30c8\u30db\u30fc\u30e0\u30c7\u30d0\u30a4\u30b9\u304c\u3001<strong>\u30d1\u30d6\u30ea\u30c3\u30af\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3068\u76f4\u63a5\u3084\u308a\u53d6\u308a\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u5185\u90e8\u3067\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306b\u901a\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9\u3092\u4f7f\u7528\u3059\u308b\u30c7\u30d0\u30a4\u30b9\u306f\u3001NAT\uff08\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a2\u30c9\u30ec\u30b9\u5909\u63db\uff09\u3092\u4ecb\u3057\u3066\u5916\u90e8\u3068\u901a\u4fe1\u3057\u307e\u3059\u3002<\/strong>NAT\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30a2\u30af\u30bb\u30b9\u7528\u306b\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9\u3092\u30d1\u30d6\u30ea\u30c3\u30afIP\u30a2\u30c9\u30ec\u30b9\u306b\u5909\u63db\u3059\u308b\u6280\u8853\u3067\u3059\u3002<a href=\"https:\/\/www.privateinternetaccess.com\/blog\/double-nat\/\">\u30c0\u30d6\u30ebNAT\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\u3002<\/a><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">APIPA\uff08\u81ea\u52d5\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9\u6307\u5b9a\uff09<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>APIPA\uff08\u81ea\u52d5\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9\u6307\u5b9a\uff09\u306f\u3001<a href=\"https:\/\/www.privateinternetaccess.com\/blog\/dhcp-and-dns\/\">DHCP<\/a>\u30b5\u30fc\u30d0\u30fc\u304c\u5229\u7528\u3067\u304d\u306a\u3044\u5834\u5408\u306b\u3001\u30c7\u30d0\u30a4\u30b9\u304c\u81ea\u8eab\u3067\u4e00\u6642\u7684\u306aIP\u30a2\u30c9\u30ec\u30b9\u3092\u5272\u308a\u5f53\u3066\u308b\u6a5f\u80fd\u3067\u3059\u3002<\/strong>APIPA\u306f\u300c169.254.0.0\/16\u300d\u306e\u7bc4\u56f2\u5185\u3067\u3001\u30e9\u30f3\u30c0\u30e0\u304b\u3064\u4e00\u6642\u7684\u306bIP\u30a2\u30c9\u30ec\u30b9\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>APIPA\u30a2\u30c9\u30ec\u30b9\u3067\u306f\u3001\u30c7\u30d0\u30a4\u30b9\u306f\u540c\u3058\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u4ed6\u306e\u30c7\u30d0\u30a4\u30b9\u3068\u306f\u901a\u4fe1\u3067\u304d\u307e\u3059<\/strong>\u304c\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002DHCP\u30b5\u30fc\u30d0\u30fc\u306b\u3088\u3063\u3066\u6709\u52b9\u306aIP\u30a2\u30c9\u30ec\u30b9\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u307e\u3067\u3001\u300c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u63a5\u7d9a\u304c\u3042\u308a\u307e\u305b\u3093\u300d\u307e\u305f\u306f\u300c\u63a5\u7d9a\u304c\u5236\u9650\u3055\u308c\u3066\u3044\u307e\u3059\u300d\u3068\u3044\u3046\u8b66\u544a\u304c\u8868\u793a\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">IP\u30af\u30e9\u30b9\u306b\u304a\u3051\u308b\u30b5\u30d6\u30cd\u30c3\u30c8\u5206\u5272\u306e\u4ed5\u7d44\u307f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u300c\u30b5\u30d6\u30cd\u30c3\u30c8\u5206\u5272\uff08\u30b5\u30d6\u30cd\u30c3\u30c8\u5316\uff09\u300d\u306f\u3001IP\u30af\u30e9\u30b9\u306e\u4ed5\u7d44\u307f\u3084IPv4\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u30c7\u30d0\u30a4\u30b9\u9593\u306e\u901a\u4fe1\u65b9\u5f0f\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u4e0d\u53ef\u6b20\u306a\u8981\u7d20\u3067\u3059\u3002\u30b5\u30d6\u30cd\u30c3\u30c8\u5206\u5272\u306f\u3001<strong>\u5927\u898f\u6a21\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u300c\u30b5\u30d6\u30cd\u30c3\u30c8\u300d\u3068\u547c\u3070\u308c\u308b\u3088\u308a\u5c0f\u3055\u304f\u7ba1\u7406\u3057\u3084\u3059\u3044\u5185\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u5206\u5272\u3059\u308b\u6280\u8853\u306e\u3053\u3068\u3067\u3059\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b5\u30d6\u30cd\u30c3\u30c8\u5206\u5272\u306f\u30011\u3064\u306e\u5927\u304d\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u3001\u90e8\u7f72\u3001\u30aa\u30d5\u30a3\u30b9\u306e\u5834\u6240\u3001\u30c7\u30d0\u30a4\u30b9\u306e\u7a2e\u985e\u3001\u307e\u305f\u306f\u904b\u7528\u4e0a\u306e\u30cb\u30fc\u30ba\u306b\u57fa\u3065\u3044\u3066\u3001\u5c0f\u3055\u306a\u30b0\u30eb\u30fc\u30d7\uff08\u30b5\u30d6\u30cd\u30c3\u30c8\uff09\u306b\u5206\u5272\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u4e0d\u8981\u306a\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u901a\u4fe1\u3092\u524a\u6e1b\u3057\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5168\u4f53\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5411\u4e0a\u3055\u305b\u3001\u30bb\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\uff08\u7d30\u5206\u5316\uff09\u3092\u5f37\u5316\u3067\u304d\u308b\u305f\u3081\u3001\u5185\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u7ba1\u7406\u3068\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u5411\u4e0a\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u30b5\u30d6\u30cd\u30c3\u30c8\u5206\u5272\u306f\u3001IPv4\u30a2\u30c9\u30ec\u30b9\u306e\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3092\u5909\u66f4\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3001<\/strong>\u30a2\u30c9\u30ec\u30b9\u306e\u30db\u30b9\u30c8\u90e8\u5206\u304b\u3089\u30d3\u30c3\u30c8\u3092\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u3067\u3001\u7ba1\u7406\u8005\u306f1\u3064\u306e\u5927\u898f\u6a21\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u304b\u3089\u8907\u6570\u306e\u5c0f\u898f\u6a21\u306a\u30b5\u30d6\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002\u4f5c\u6210\u3055\u308c\u308b\u30b5\u30d6\u30cd\u30c3\u30c8\u306e\u6570\u304c\u5897\u3048\u308b\u307b\u3069\u3001\u5404\u30b5\u30d6\u30cd\u30c3\u30c8\u304c\u53ce\u5bb9\u3067\u304d\u308b\u30db\u30b9\u30c8\u6570\u306f\u6e1b\u5c11\u3059\u308b\u305f\u3081\u3001\u7d44\u7e54\u306f\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306e\u6d41\u308c\u3001\u30c7\u30d0\u30a4\u30b9\u306e\u69cb\u6210\u3001\u304a\u3088\u3073IP\u30a2\u30c9\u30ec\u30b9\u306e\u5272\u308a\u5f53\u3066\u3092\u3088\u308a\u7d30\u304b\u304f\u5236\u5fa1\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u30b5\u30d6\u30cd\u30c3\u30c8\u5206\u5272\u306f\u3001\u5f93\u6765\u306e\u30af\u30e9\u30b9\u5236\uff08\u30af\u30e9\u30b9\u30d5\u30eb\u30a2\u30c9\u30ec\u30c3\u30b7\u30f3\u30b0\uff09\u306e\u30a2\u30c9\u30ec\u30b9\u6307\u5b9a\u30b7\u30b9\u30c6\u30e0\u3092\u5927\u5e45\u306b\u6539\u5584\u3067\u304d\u307e\u3059\u304c\u3001IPv4\u306e\u6839\u672c\u7684\u306a\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/strong>IP\u30a2\u30c9\u30ec\u30b9\u306e\u5404\u30af\u30e9\u30b9\u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b5\u30a4\u30ba\u304c\u56fa\u5b9a\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u30af\u30e9\u30b9\u30d5\u30eb\u30a2\u30c9\u30ec\u30c3\u30b7\u30f3\u30b0\u3067\u306f\u5fc5\u8981\u3068\u3059\u308b\u3088\u308a\u3082\u9065\u304b\u306b\u591a\u304f\u306e\u30a2\u30c9\u30ec\u30b9\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u3068\u3044\u3046\u4e8b\u614b\u304c\u591a\u304f\u306e\u7d44\u7e54\u3067\u767a\u751f\u3057\u3066\u3057\u307e\u3044\u3001IPv4\u30a2\u30c9\u30ec\u30b9\u5168\u4f53\u3067\u304b\u306a\u308a\u306e\u7121\u99c4\u304c\u751f\u3058\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u3055\u3089\u306b\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u304c\u6025\u901f\u306b\u666e\u53ca\u3059\u308b\u306b\u3064\u308c\u3001\u30af\u30e9\u30b9\u30d5\u30eb\u30a2\u30c9\u30ec\u30c3\u30b7\u30f3\u30b0\u3067\u306e\u5bfe\u5fdc\u306b\u9650\u754c\u304c\u8a2a\u308c\u305f<\/strong>\u305f\u3081\u300cCIDR\uff08\u30af\u30e9\u30b9\u30ec\u30b9\u30fb\u30a4\u30f3\u30bf\u30fc\u30c9\u30e1\u30a4\u30f3\u30fb\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\uff09\u300d\u304c\u5c0e\u5165\u3055\u308c\u308b\u3053\u3068\u3068\u306a\u308a\u307e\u3057\u305f\u3002CIDR\u306f\u67d4\u8edf\u6027\u3068\u62e1\u5f35\u6027\u306b\u512a\u308c\u305f\u30b7\u30b9\u30c6\u30e0\u3067\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u5206\u3051\u3092\u5ec3\u6b62\u3057\u3001\u73fe\u4ee3\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5168\u4f53\u306b\u304a\u3051\u308b\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u52b9\u7387\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3055\u305b\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">CIDR\uff1aIP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u5206\u3051\u306b\u4ee3\u308f\u308b\u65b0\u3057\u3044\u65b9\u5f0f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u300c\u30af\u30e9\u30b9\u30ec\u30b9\u30fb\u30a4\u30f3\u30bf\u30fc\u30c9\u30e1\u30a4\u30f3\u30fb\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\uff08<a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc4632\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">CIDR<\/a>\uff09\u300d\u306f\u3001\u5f93\u6765\u306e\u30af\u30e9\u30b9\u30d5\u30eb\u30a2\u30c9\u30ec\u30c3\u30b7\u30f3\u30b0\u306b\u4ee3\u308f\u308a\u3001\u306f\u308b\u304b\u306b\u67d4\u8edf\u3067\u52b9\u7387\u7684\u306a\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u3067\u3059\u3002CIDR\u306f\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u5206\u3051\u3092\u5ec3\u6b62\u3057\u3001<strong>VLSM\uff08Variable Length Subnet Mask\uff1a\u53ef\u5909\u9577\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\uff09\u3068CIDR\u8868\u8a18\u6cd5\u3092\u63a1\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CIDR\u3067\u306f\u3001<strong>IP\u30a2\u30c9\u30ec\u30b9\u306e\u672b\u5c3e\u306b\u300c\/22\u300d\u306e\u3088\u3046\u306a\u30b5\u30d5\u30a3\u30c3\u30af\u30b9\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/strong>\u30b9\u30e9\u30c3\u30b7\u30e5\u306e\u5f8c\u306e\u6570\u5b57\u306f\u3001\u30a2\u30c9\u30ec\u30b9\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u90e8\u5206\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u30d3\u30c3\u30c8\u6570\u3092\u793a\u3057\u3066\u304a\u308a\u3001\u3053\u308c\u306b\u3088\u308a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u898f\u6a21\u3092\u3088\u308a\u9ad8\u7cbe\u5ea6\u306b\u5b9a\u7fa9\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3057\u305f\u3002<br><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u3053\u306e\u4ed5\u7d44\u307f\u306b\u3088\u308a\u3001IPv4\u30a2\u30c9\u30ec\u30b9\u7a7a\u9593\u306e\u7121\u99c4\u306e\u524a\u6e1b\u3001\u30eb\u30fc\u30c8\u96c6\u7d04\u306e\u6539\u5584\u3001\u305d\u3057\u3066\u30af\u30e9\u30b9\u6bce\u306e\u56fa\u5b9a\u7684\u306a\u67a0\u7d44\u307f\u306b\u5236\u9650\u3055\u308c\u308b\u3053\u3068\u306a\u304f\u52b9\u7387\u7684\u306a\u62e1\u5f35\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/strong>\u307e\u305f\u3001CIDR\u306f\u5fc5\u8981\u306a\u30b5\u30a4\u30ba\u306b\u5408\u308f\u305b\u3066\u67d4\u8edf\u306bIP\u30a2\u30c9\u30ec\u30b9\u3092\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u3067\u3001IPv4\u30a2\u30c9\u30ec\u30b9\u306e\u67af\u6e07\u3092\u9045\u3089\u305b\u308b\u4e0a\u3067\u3082\u91cd\u8981\u306a\u5f79\u5272\u3092\u62c5\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>CIDR\u306f\u3001IPv4\u304a\u3088\u3073IPv6\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u4e21\u65b9\u306b\u304a\u3044\u3066\u4e00\u822c\u7684\u306b\u666e\u53ca\u3057\u3066\u3044\u308b\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u304a\u3088\u3073IP\u5272\u308a\u5f53\u3066\u65b9\u5f0f\u3067\u3042\u308a\u3001<\/strong>\u73fe\u4ee3\u306e\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30a4\u30f3\u30d5\u30e9\u306e\u904b\u7528\u306b\u304a\u3044\u3066\u4e2d\u6838\u7684\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"h-\u3088\u304f\u3042\u308b\u8cea\u554f\" class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1779875892215\"><h3 class=\"schema-faq-question\">IP\u30a2\u30c9\u30ec\u30b9\u3068\u306f\uff1f<\/h3> <p class=\"schema-faq-answer\">IP\u30a2\u30c9\u30ec\u30b9\u3068\u306f\u3001\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3001\u30bf\u30d6\u30ec\u30c3\u30c8\u3001\u5bb6\u5ead\u7528\u30eb\u30fc\u30bf\u30fc\u306a\u3069\u306e\u6a5f\u5668\u3092\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u3067\u8b58\u5225\u3059\u308b\u305f\u3081\u306e<a href=\"#ThePrinciples\">\u4e00\u610f\u306e\u8b58\u5225\u756a\u53f7<\/a>\u306e\u3053\u3068\u3067\u3059\u3002IP\u30a2\u30c9\u30ec\u30b9\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u3084\u305d\u306e\u4ed6\u306e\u30c7\u30d0\u30a4\u30b9\u306f\u901a\u4fe1\u30c7\u30fc\u30bf\u3092\u6b63\u3057\u304f\u3084\u308a\u53d6\u308a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br><br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1779875905189\"><h3 class=\"schema-faq-question\">IP\u30a2\u30c9\u30ec\u30b9\u306f\u3001\u3044\u304f\u3064\u306e\u30af\u30e9\u30b9\u306b\u5206\u985e\u3055\u308c\u307e\u3059\u304b\uff1f<\/h3> <p class=\"schema-faq-answer\">IPv4\u30a2\u30c9\u30ec\u30b9\u306f<a href=\"#The5Classes\">A\u3001B\u3001C\u3001D\u3001E\u306e5\u3064\u306e\u30af\u30e9\u30b9\u306b\u5206\u985e\u3055\u308c\u307e\u3059<\/a>\u3002\u30af\u30e9\u30b9A\u3001B\u3001C\u306f\u5f93\u6765\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3084\u30c7\u30d0\u30a4\u30b9\u306e\u30a2\u30c9\u30ec\u30b9\u6307\u5b9a\u306b\u4f7f\u7528\u3055\u308c\u308b\u306e\u306b\u5bfe\u3057\u3001\u30af\u30e9\u30b9D\u304a\u3088\u3073E\u306f\u7279\u5b9a\u306e\u4e88\u7d04\u9818\u57df\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br><br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1779875917315\"><h3 class=\"schema-faq-question\">IP\u30a2\u30c9\u30ec\u30b9\u306e\u5404\u30af\u30e9\u30b9\u3068\u7bc4\u56f2\u306e\u4ed5\u7d44\u307f\u3068\u306f\uff1f<\/h3> <p class=\"schema-faq-answer\">IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u306f\u3001<a href=\"#The5Classes\">\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u898f\u6a21\u3084\u76ee\u7684\u306b\u57fa\u3065\u3044\u3066IPv4\u30a2\u30c9\u30ec\u30b9\u3092\u30b0\u30eb\u30fc\u30d7\u5206\u3051\u3059\u308b\u3082\u306e\u3067\u3059<\/a>\u3002\u30af\u30e9\u30b9A\u306f\u5927\u898f\u6a21\u7d44\u7e54\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5411\u3051\u3001\u30af\u30e9\u30b9B\u306f\u4e2d\u898f\u6a21\u7d44\u7e54\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5411\u3051\u3001\u30af\u30e9\u30b9C\u306f\u4e00\u822c\u5bb6\u5ead\u3084\u5c0f\u898f\u6a21\u306a\u4e8b\u696d\u5411\u3051\u306b\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30af\u30e9\u30b9D\u306f\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u901a\u4fe1\u3092\u51e6\u7406\u3057\u3001\u30af\u30e9\u30b9E\u306f\u5b9f\u9a13\u7684\u306a\u7528\u9014\u306e\u305f\u3081\u306b\u4e88\u7d04\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u5404\u30af\u30e9\u30b9\u306f\u7279\u5b9a\u306eIP\u30a2\u30c9\u30ec\u30b9\u306e\u6570\u5024\u7bc4\u56f2\u3092\u4f7f\u7528\u3057\u3066\u304a\u308a\u3001\u5404\u30a2\u30c9\u30ec\u30b9\uff08\u30c7\u30d0\u30a4\u30b9\uff09\u304c\u3069\u306e\u898f\u6a21\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u5c5e\u3057\u3066\u3044\u308b\u304b\u3092\u8b58\u5225\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<br><br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1779875931361\"><h3 class=\"schema-faq-question\">\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u3068\u306f\uff1f<\/h3> <p class=\"schema-faq-answer\"><a href=\"#PrivateIPAddresses\">\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9<\/a>\u30af\u30e9\u30b9\u3068\u306f\u3001\u30af\u30e9\u30b9A\u3001B\u3001C\u306b\u5c5e\u3059\u308b\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7528\u306b\u4e88\u7d04\u3055\u308c\u305fIP\u30a2\u30c9\u30ec\u30b9\u306e\u30d6\u30ed\u30c3\u30af\u3092\u6307\u3057\u307e\u3059\u3002\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9\u306f\u3001\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3084\u30af\u30e9\u30a6\u30c9\u4e0a\u306e\u5185\u90e8\u901a\u4fe1\u306b\u4f7f\u7528\u3055\u308c\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3068\u901a\u4fe1\u3059\u308b\u306b\u306f\u30d1\u30d6\u30ea\u30c3\u30af\uff08\u30b0\u30ed\u30fc\u30d0\u30eb\uff09IP\u30a2\u30c9\u30ec\u30b9\u306b\u5909\u63db\u3059\u308b\u51e6\u7406\u304c\u767a\u751f\u3057\u307e\u3059\u3002<br><br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1779875943732\"><h3 class=\"schema-faq-question\">\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u304a\u3051\u308bIP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u306e\u5f79\u5272\u3068\u306f\uff1f<\/h3> <p class=\"schema-faq-answer\"><a href=\"#The5Classes\">IP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9<\/a>\u306f\u901a\u4fe1\u3068\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u7c21\u7d20\u5316\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u6700\u521d\u306e\u30aa\u30af\u30c6\u30c3\u30c8\u306b\u57fa\u3065\u3044\u3066IP\u30a2\u30c9\u30ec\u30b9\u3092\u30af\u30e9\u30b9\u5206\u3051\u3059\u308b\u3053\u3068\u3067\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u898f\u6a21\u3084\u7528\u9014\u3092\u7c21\u5358\u306b\u8b58\u5225\u3067\u304d\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u52b9\u7387\u304c\u5411\u4e0a\u3057\u3001\u7d44\u7e54\u306e\u30cb\u30fc\u30ba\u306b\u5fdc\u3058\u3066\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u62e1\u5f35\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<br><br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1779875956057\"><h3 class=\"schema-faq-question\">VPN\u306fIP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u3092\u5909\u66f4\u3057\u305f\u308a\u3001\u96a0\u3057\u305f\u308a\u3067\u304d\u307e\u3059\u304b\uff1f<\/h3> <p class=\"schema-faq-answer\"><a href=\"https:\/\/www.privateinternetaccess.com\/ja\/what-is-vpn\">VPN<\/a>\u3092\u4f7f\u3046\u3068VPN\u30b5\u30fc\u30d0\u30fc\u304b\u3089IP\u30a2\u30c9\u30ec\u30b9\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u3001\u5b9f\u969b\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u96a0\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u306b\u306fVPN\u30b5\u30fc\u30d0\u30fc\u306e\u30d1\u30d6\u30ea\u30c3\u30afIP\u30a2\u30c9\u30ec\u30b9\u304c\u8868\u793a\u3055\u308c\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u306a\u304a\u3001VPN\u30b5\u30fc\u30d3\u30b9\u3084\u63a5\u7d9a\u3059\u308b\u30b5\u30fc\u30d0\u30fc\u306b\u3088\u3063\u3066\u306f\u3001\u5b9f\u969b\u3068\u306f\u7570\u306a\u308b\u30af\u30e9\u30b9\u306eIP\u30a2\u30c9\u30ec\u30b9\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u307e\u3059\u3002<br><br><\/p> <\/div> <\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u53c2\u8003\u6587\u732e<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ipv4.global\/events\/4-6-difference\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">The Difference Between IPv4 and IPv6 \u2013 IPv4.Global<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.rfc-editor.org\/info\/rfc791\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">RFC 791: STD 5: Internet Protocol \u2013 RFC Editor\u00a0<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc1519.html?\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Classless Inter-Domain Routing (CIDR): an Address Assignment and Aggregation Strategy \u2013 RFC Editor<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.cisco.com\/site\/us\/en\/learn\/topics\/networking\/what-is-ipv6.html\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">What Is IPv6? \u2013 Cisco<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ibm.com\/docs\/en\/aix\/7.2.0?topic=addresses-class\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Class A addresses \u2013 IBM<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.cisco.com\/c\/en\/us\/support\/docs\/ip\/routing-information-protocol-rip\/13788-3.html?\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Configure IP Addresses and Unique Subnets for New Users \u2013 Cisco<\/a><\/li>\n<\/ol>\n\n\n\n\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u521d\u671f\u306e\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3067\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u540c\u58eb\u304c\u901a\u4fe1\u30c7\u30fc\u30bf\u3092\u3084\u308a\u53d6\u308a\u3067\u304d\u308b\u3088\u3046\u306b\u300cIP\uff08\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30d7\u30ed\u30c8\u30b3\u30eb\uff09\u30a2\u30c9\u30ec\u30b9\u300d\u306b\u57fa\u3065\u304f\u30b7\u30b9\u30c6\u30e0\u304c\u69cb\u7bc9\u3055\u308c\u307e\u3057\u305f\u3002\u305d\u306e\u5f8c\u3001IP\u30a2\u30c9\u30ec\u30b9\u3092\u6574\u7406\u3059\u308b\u305f\u3081\u306e\u5206\u985e\u3068\u3057\u3066\u300cIP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u300d &hellip; <a href=\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306eIP\u30af\u30e9\u30b9\u3068\u306f\u2502\u4eca\u65e5\u306b\u304a\u3051\u308b\u91cd\u8981\u6027\u3068\u306f\uff1f&#8221;<\/span><\/a><\/p>\n","protected":false},"author":151,"featured_media":40901,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_stopmodifiedupdate":false,"_modified_date":"","footnotes":""},"categories":[3065],"tags":[],"class_list":["post-40902","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-3065"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v26.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u3068\u306f\uff1aIP\u30af\u30e9\u30b9\u306e\u5206\u985e\u3001\u7bc4\u56f2\u3001\u7528\u9014 | PIA<\/title>\n<meta name=\"description\" content=\"IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u3068\u306f\u4f55\u304b\u3001IPv4\u306e\u30af\u30e9\u30b9A\u3001B\u3001C\u3001D\u3001E\u306e\u5206\u985e\u3084\u4ed5\u7d44\u307f\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u5206\u3051\u306b\u4ee3\u308f\u308bCIDR\u5c0e\u5165\u306e\u7d4c\u7def\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306eIP\u30af\u30e9\u30b9\u3068\u306f\u2502\u4eca\u65e5\u306b\u304a\u3051\u308b\u91cd\u8981\u6027\u3068\u306f\uff1f\" \/>\n<meta property=\"og:description\" content=\"IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u3068\u306f\u4f55\u304b\u3001IPv4\u306e\u30af\u30e9\u30b9A\u3001B\u3001C\u3001D\u3001E\u306e\u5206\u985e\u3084\u4ed5\u7d44\u307f\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u5206\u3051\u306b\u4ee3\u308f\u308bCIDR\u5c0e\u5165\u306e\u7d4c\u7def\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/\" \/>\n<meta property=\"og:site_name\" content=\"PIA\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/privateinternetaccess\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-05-27T10:07:44+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-26T14:45:30+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2026\/05\/featured-image-IP-Address-Classes-1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"2400\" \/>\n\t<meta property=\"og:image:height\" content=\"1600\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Andrea Miliani\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@buyvpnservice\" \/>\n<meta name=\"twitter:site\" content=\"@buyvpnservice\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u30a2\u30f3\u30c9\u30ec\u30a2\u30fb\u30df\u30ea\u30a2\u30fc\u30cb\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"2\u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/\"},\"author\":{\"name\":\"Andrea Miliani\",\"@id\":\"https:\/\/www.privateinternetaccess.com\/blog\/#\/schema\/person\/02f14068bd5cafa9047c8b87f897b8f3\"},\"headline\":\"\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306eIP\u30af\u30e9\u30b9\u3068\u306f\u2502\u4eca\u65e5\u306b\u304a\u3051\u308b\u91cd\u8981\u6027\u3068\u306f\uff1f\",\"datePublished\":\"2026-05-27T10:07:44+00:00\",\"dateModified\":\"2026-08-26T14:45:30+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/\"},\"wordCount\":270,\"publisher\":{\"@id\":\"https:\/\/www.privateinternetaccess.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2026\/05\/featured-image-IP-Address-Classes-1.png\",\"inLanguage\":\"ja\"},{\"@type\":[\"WebPage\",\"FAQPage\"],\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/\",\"url\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/\",\"name\":\"IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u3068\u306f\uff1aIP\u30af\u30e9\u30b9\u306e\u5206\u985e\u3001\u7bc4\u56f2\u3001\u7528\u9014 | PIA\",\"isPartOf\":{\"@id\":\"https:\/\/www.privateinternetaccess.com\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2026\/05\/featured-image-IP-Address-Classes-1.png\",\"datePublished\":\"2026-05-27T10:07:44+00:00\",\"dateModified\":\"2026-08-26T14:45:30+00:00\",\"description\":\"IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u3068\u306f\u4f55\u304b\u3001IPv4\u306e\u30af\u30e9\u30b9A\u3001B\u3001C\u3001D\u3001E\u306e\u5206\u985e\u3084\u4ed5\u7d44\u307f\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u5206\u3051\u306b\u4ee3\u308f\u308bCIDR\u5c0e\u5165\u306e\u7d4c\u7def\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u3002\",\"breadcrumb\":{\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#breadcrumb\"},\"mainEntity\":[{\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875892215\"},{\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875905189\"},{\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875917315\"},{\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875931361\"},{\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875943732\"},{\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875956057\"}],\"inLanguage\":\"ja\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#primaryimage\",\"url\":\"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2026\/05\/featured-image-IP-Address-Classes-1.png\",\"contentUrl\":\"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2026\/05\/featured-image-IP-Address-Classes-1.png\",\"width\":2400,\"height\":1600},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.privateinternetaccess.com\/blog\/ja\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306eIP\u30af\u30e9\u30b9\u3068\u306f\u2502\u4eca\u65e5\u306b\u304a\u3051\u308b\u91cd\u8981\u6027\u3068\u306f\uff1f\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.privateinternetaccess.com\/blog\/#website\",\"url\":\"https:\/\/www.privateinternetaccess.com\/blog\/\",\"name\":\"PIA\",\"description\":\"Online privacy news from around the world.\",\"publisher\":{\"@id\":\"https:\/\/www.privateinternetaccess.com\/blog\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.privateinternetaccess.com\/blog\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"ja\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.privateinternetaccess.com\/blog\/#organization\",\"name\":\"Private Internet Access\",\"url\":\"https:\/\/www.privateinternetaccess.com\/blog\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\/\/www.privateinternetaccess.com\/blog\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2018\/07\/pialogowhitekglogo.png\",\"contentUrl\":\"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2018\/07\/pialogowhitekglogo.png\",\"width\":1200,\"height\":1200,\"caption\":\"Private Internet Access\"},\"image\":{\"@id\":\"https:\/\/www.privateinternetaccess.com\/blog\/#\/schema\/logo\/image\/\"},\"sameAs\":[\"https:\/\/www.facebook.com\/privateinternetaccess\/\",\"https:\/\/x.com\/buyvpnservice\",\"https:\/\/www.instagram.com\/piavpn\/\",\"https:\/\/www.youtube.com\/channel\/UClyJZ47Rizb1xnwuKXDI0_w\"]},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.privateinternetaccess.com\/blog\/#\/schema\/person\/02f14068bd5cafa9047c8b87f897b8f3\",\"name\":\"Andrea Miliani\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\/\/www.privateinternetaccess.com\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2025\/11\/image-4-1-96x96.png\",\"contentUrl\":\"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2025\/11\/image-4-1-96x96.png\",\"caption\":\"Andrea Miliani\"},\"description\":\"Andrea Miliani is a writer at Private Internet Access with over 10 years of experience creating accessible digital content. With a background in journalism, she has developed a strong passion for tech news, artificial intelligence, and cybersecurity. When she\u2019s not writing, Andrea enjoys hiking and connecting with nature, spending time with friends, and watching movies and TV shows.\",\"url\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/author\/andrea-miliani\/\"},{\"@type\":\"Question\",\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875892215\",\"position\":1,\"url\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875892215\",\"name\":\"IP\u30a2\u30c9\u30ec\u30b9\u3068\u306f\uff1f\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"IP\u30a2\u30c9\u30ec\u30b9\u3068\u306f\u3001\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3001\u30bf\u30d6\u30ec\u30c3\u30c8\u3001\u5bb6\u5ead\u7528\u30eb\u30fc\u30bf\u30fc\u306a\u3069\u306e\u6a5f\u5668\u3092\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u3067\u8b58\u5225\u3059\u308b\u305f\u3081\u306e<a href=\\\"#ThePrinciples\\\">\u4e00\u610f\u306e\u8b58\u5225\u756a\u53f7<\/a>\u306e\u3053\u3068\u3067\u3059\u3002IP\u30a2\u30c9\u30ec\u30b9\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u3084\u305d\u306e\u4ed6\u306e\u30c7\u30d0\u30a4\u30b9\u306f\u901a\u4fe1\u30c7\u30fc\u30bf\u3092\u6b63\u3057\u304f\u3084\u308a\u53d6\u308a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br\/><br\/>\",\"inLanguage\":\"ja\"},\"inLanguage\":\"ja\"},{\"@type\":\"Question\",\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875905189\",\"position\":2,\"url\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875905189\",\"name\":\"IP\u30a2\u30c9\u30ec\u30b9\u306f\u3001\u3044\u304f\u3064\u306e\u30af\u30e9\u30b9\u306b\u5206\u985e\u3055\u308c\u307e\u3059\u304b\uff1f\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"IPv4\u30a2\u30c9\u30ec\u30b9\u306f<a href=\\\"#The5Classes\\\">A\u3001B\u3001C\u3001D\u3001E\u306e5\u3064\u306e\u30af\u30e9\u30b9\u306b\u5206\u985e\u3055\u308c\u307e\u3059<\/a>\u3002\u30af\u30e9\u30b9A\u3001B\u3001C\u306f\u5f93\u6765\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3084\u30c7\u30d0\u30a4\u30b9\u306e\u30a2\u30c9\u30ec\u30b9\u6307\u5b9a\u306b\u4f7f\u7528\u3055\u308c\u308b\u306e\u306b\u5bfe\u3057\u3001\u30af\u30e9\u30b9D\u304a\u3088\u3073E\u306f\u7279\u5b9a\u306e\u4e88\u7d04\u9818\u57df\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br\/><br\/>\",\"inLanguage\":\"ja\"},\"inLanguage\":\"ja\"},{\"@type\":\"Question\",\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875917315\",\"position\":3,\"url\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875917315\",\"name\":\"IP\u30a2\u30c9\u30ec\u30b9\u306e\u5404\u30af\u30e9\u30b9\u3068\u7bc4\u56f2\u306e\u4ed5\u7d44\u307f\u3068\u306f\uff1f\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u306f\u3001<a href=\\\"#The5Classes\\\">\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u898f\u6a21\u3084\u76ee\u7684\u306b\u57fa\u3065\u3044\u3066IPv4\u30a2\u30c9\u30ec\u30b9\u3092\u30b0\u30eb\u30fc\u30d7\u5206\u3051\u3059\u308b\u3082\u306e\u3067\u3059<\/a>\u3002\u30af\u30e9\u30b9A\u306f\u5927\u898f\u6a21\u7d44\u7e54\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5411\u3051\u3001\u30af\u30e9\u30b9B\u306f\u4e2d\u898f\u6a21\u7d44\u7e54\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5411\u3051\u3001\u30af\u30e9\u30b9C\u306f\u4e00\u822c\u5bb6\u5ead\u3084\u5c0f\u898f\u6a21\u306a\u4e8b\u696d\u5411\u3051\u306b\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30af\u30e9\u30b9D\u306f\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u901a\u4fe1\u3092\u51e6\u7406\u3057\u3001\u30af\u30e9\u30b9E\u306f\u5b9f\u9a13\u7684\u306a\u7528\u9014\u306e\u305f\u3081\u306b\u4e88\u7d04\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u5404\u30af\u30e9\u30b9\u306f\u7279\u5b9a\u306eIP\u30a2\u30c9\u30ec\u30b9\u306e\u6570\u5024\u7bc4\u56f2\u3092\u4f7f\u7528\u3057\u3066\u304a\u308a\u3001\u5404\u30a2\u30c9\u30ec\u30b9\uff08\u30c7\u30d0\u30a4\u30b9\uff09\u304c\u3069\u306e\u898f\u6a21\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u5c5e\u3057\u3066\u3044\u308b\u304b\u3092\u8b58\u5225\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<br\/><br\/>\",\"inLanguage\":\"ja\"},\"inLanguage\":\"ja\"},{\"@type\":\"Question\",\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875931361\",\"position\":4,\"url\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875931361\",\"name\":\"\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u3068\u306f\uff1f\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<a href=\\\"#PrivateIPAddresses\\\">\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9<\/a>\u30af\u30e9\u30b9\u3068\u306f\u3001\u30af\u30e9\u30b9A\u3001B\u3001C\u306b\u5c5e\u3059\u308b\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7528\u306b\u4e88\u7d04\u3055\u308c\u305fIP\u30a2\u30c9\u30ec\u30b9\u306e\u30d6\u30ed\u30c3\u30af\u3092\u6307\u3057\u307e\u3059\u3002\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9\u306f\u3001\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3084\u30af\u30e9\u30a6\u30c9\u4e0a\u306e\u5185\u90e8\u901a\u4fe1\u306b\u4f7f\u7528\u3055\u308c\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3068\u901a\u4fe1\u3059\u308b\u306b\u306f\u30d1\u30d6\u30ea\u30c3\u30af\uff08\u30b0\u30ed\u30fc\u30d0\u30eb\uff09IP\u30a2\u30c9\u30ec\u30b9\u306b\u5909\u63db\u3059\u308b\u51e6\u7406\u304c\u767a\u751f\u3057\u307e\u3059\u3002<br\/><br\/>\",\"inLanguage\":\"ja\"},\"inLanguage\":\"ja\"},{\"@type\":\"Question\",\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875943732\",\"position\":5,\"url\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875943732\",\"name\":\"\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u304a\u3051\u308bIP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u306e\u5f79\u5272\u3068\u306f\uff1f\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<a href=\\\"#The5Classes\\\">IP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9<\/a>\u306f\u901a\u4fe1\u3068\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u7c21\u7d20\u5316\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u6700\u521d\u306e\u30aa\u30af\u30c6\u30c3\u30c8\u306b\u57fa\u3065\u3044\u3066IP\u30a2\u30c9\u30ec\u30b9\u3092\u30af\u30e9\u30b9\u5206\u3051\u3059\u308b\u3053\u3068\u3067\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u898f\u6a21\u3084\u7528\u9014\u3092\u7c21\u5358\u306b\u8b58\u5225\u3067\u304d\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u52b9\u7387\u304c\u5411\u4e0a\u3057\u3001\u7d44\u7e54\u306e\u30cb\u30fc\u30ba\u306b\u5fdc\u3058\u3066\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u62e1\u5f35\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<br\/><br\/>\",\"inLanguage\":\"ja\"},\"inLanguage\":\"ja\"},{\"@type\":\"Question\",\"@id\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875956057\",\"position\":6,\"url\":\"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875956057\",\"name\":\"VPN\u306fIP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u3092\u5909\u66f4\u3057\u305f\u308a\u3001\u96a0\u3057\u305f\u308a\u3067\u304d\u307e\u3059\u304b\uff1f\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<a href=\\\"https:\/\/www.privateinternetaccess.com\/ja\/what-is-vpn\\\">VPN<\/a>\u3092\u4f7f\u3046\u3068VPN\u30b5\u30fc\u30d0\u30fc\u304b\u3089IP\u30a2\u30c9\u30ec\u30b9\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u3001\u5b9f\u969b\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u96a0\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u306b\u306fVPN\u30b5\u30fc\u30d0\u30fc\u306e\u30d1\u30d6\u30ea\u30c3\u30afIP\u30a2\u30c9\u30ec\u30b9\u304c\u8868\u793a\u3055\u308c\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u306a\u304a\u3001VPN\u30b5\u30fc\u30d3\u30b9\u3084\u63a5\u7d9a\u3059\u308b\u30b5\u30fc\u30d0\u30fc\u306b\u3088\u3063\u3066\u306f\u3001\u5b9f\u969b\u3068\u306f\u7570\u306a\u308b\u30af\u30e9\u30b9\u306eIP\u30a2\u30c9\u30ec\u30b9\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u307e\u3059\u3002<br\/><br\/>\",\"inLanguage\":\"ja\"},\"inLanguage\":\"ja\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u3068\u306f\uff1aIP\u30af\u30e9\u30b9\u306e\u5206\u985e\u3001\u7bc4\u56f2\u3001\u7528\u9014 | PIA","description":"IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u3068\u306f\u4f55\u304b\u3001IPv4\u306e\u30af\u30e9\u30b9A\u3001B\u3001C\u3001D\u3001E\u306e\u5206\u985e\u3084\u4ed5\u7d44\u307f\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u5206\u3051\u306b\u4ee3\u308f\u308bCIDR\u5c0e\u5165\u306e\u7d4c\u7def\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u3002","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/","og_locale":"ja_JP","og_type":"article","og_title":"\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306eIP\u30af\u30e9\u30b9\u3068\u306f\u2502\u4eca\u65e5\u306b\u304a\u3051\u308b\u91cd\u8981\u6027\u3068\u306f\uff1f","og_description":"IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u3068\u306f\u4f55\u304b\u3001IPv4\u306e\u30af\u30e9\u30b9A\u3001B\u3001C\u3001D\u3001E\u306e\u5206\u985e\u3084\u4ed5\u7d44\u307f\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u5206\u3051\u306b\u4ee3\u308f\u308bCIDR\u5c0e\u5165\u306e\u7d4c\u7def\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u3002","og_url":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/","og_site_name":"PIA","article_publisher":"https:\/\/www.facebook.com\/privateinternetaccess\/","article_published_time":"2026-05-27T10:07:44+00:00","article_modified_time":"2026-08-26T14:45:30+00:00","og_image":[{"width":2400,"height":1600,"url":"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2026\/05\/featured-image-IP-Address-Classes-1.png","type":"image\/png"}],"author":"Andrea Miliani","twitter_card":"summary_large_image","twitter_creator":"@buyvpnservice","twitter_site":"@buyvpnservice","twitter_misc":{"\u57f7\u7b46\u8005":"\u30a2\u30f3\u30c9\u30ec\u30a2\u30fb\u30df\u30ea\u30a2\u30fc\u30cb","\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593":"2\u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#article","isPartOf":{"@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/"},"author":{"name":"Andrea Miliani","@id":"https:\/\/www.privateinternetaccess.com\/blog\/#\/schema\/person\/02f14068bd5cafa9047c8b87f897b8f3"},"headline":"\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306eIP\u30af\u30e9\u30b9\u3068\u306f\u2502\u4eca\u65e5\u306b\u304a\u3051\u308b\u91cd\u8981\u6027\u3068\u306f\uff1f","datePublished":"2026-05-27T10:07:44+00:00","dateModified":"2026-08-26T14:45:30+00:00","mainEntityOfPage":{"@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/"},"wordCount":270,"publisher":{"@id":"https:\/\/www.privateinternetaccess.com\/blog\/#organization"},"image":{"@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#primaryimage"},"thumbnailUrl":"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2026\/05\/featured-image-IP-Address-Classes-1.png","inLanguage":"ja"},{"@type":["WebPage","FAQPage"],"@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/","url":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/","name":"IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u3068\u306f\uff1aIP\u30af\u30e9\u30b9\u306e\u5206\u985e\u3001\u7bc4\u56f2\u3001\u7528\u9014 | PIA","isPartOf":{"@id":"https:\/\/www.privateinternetaccess.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#primaryimage"},"image":{"@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#primaryimage"},"thumbnailUrl":"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2026\/05\/featured-image-IP-Address-Classes-1.png","datePublished":"2026-05-27T10:07:44+00:00","dateModified":"2026-08-26T14:45:30+00:00","description":"IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u3068\u306f\u4f55\u304b\u3001IPv4\u306e\u30af\u30e9\u30b9A\u3001B\u3001C\u3001D\u3001E\u306e\u5206\u985e\u3084\u4ed5\u7d44\u307f\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u5206\u3051\u306b\u4ee3\u308f\u308bCIDR\u5c0e\u5165\u306e\u7d4c\u7def\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u3002","breadcrumb":{"@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#breadcrumb"},"mainEntity":[{"@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875892215"},{"@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875905189"},{"@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875917315"},{"@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875931361"},{"@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875943732"},{"@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875956057"}],"inLanguage":"ja","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/"]}]},{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#primaryimage","url":"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2026\/05\/featured-image-IP-Address-Classes-1.png","contentUrl":"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2026\/05\/featured-image-IP-Address-Classes-1.png","width":2400,"height":1600},{"@type":"BreadcrumbList","@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.privateinternetaccess.com\/blog\/ja\/"},{"@type":"ListItem","position":2,"name":"\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306eIP\u30af\u30e9\u30b9\u3068\u306f\u2502\u4eca\u65e5\u306b\u304a\u3051\u308b\u91cd\u8981\u6027\u3068\u306f\uff1f"}]},{"@type":"WebSite","@id":"https:\/\/www.privateinternetaccess.com\/blog\/#website","url":"https:\/\/www.privateinternetaccess.com\/blog\/","name":"PIA","description":"Online privacy news from around the world.","publisher":{"@id":"https:\/\/www.privateinternetaccess.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.privateinternetaccess.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"ja"},{"@type":"Organization","@id":"https:\/\/www.privateinternetaccess.com\/blog\/#organization","name":"Private Internet Access","url":"https:\/\/www.privateinternetaccess.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/www.privateinternetaccess.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2018\/07\/pialogowhitekglogo.png","contentUrl":"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2018\/07\/pialogowhitekglogo.png","width":1200,"height":1200,"caption":"Private Internet Access"},"image":{"@id":"https:\/\/www.privateinternetaccess.com\/blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/privateinternetaccess\/","https:\/\/x.com\/buyvpnservice","https:\/\/www.instagram.com\/piavpn\/","https:\/\/www.youtube.com\/channel\/UClyJZ47Rizb1xnwuKXDI0_w"]},{"@type":"Person","@id":"https:\/\/www.privateinternetaccess.com\/blog\/#\/schema\/person\/02f14068bd5cafa9047c8b87f897b8f3","name":"Andrea Miliani","image":{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/www.privateinternetaccess.com\/blog\/#\/schema\/person\/image\/","url":"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2025\/11\/image-4-1-96x96.png","contentUrl":"https:\/\/www.privateinternetaccess.com\/blog\/wp-content\/uploads\/2025\/11\/image-4-1-96x96.png","caption":"Andrea Miliani"},"description":"Andrea Miliani is a writer at Private Internet Access with over 10 years of experience creating accessible digital content. With a background in journalism, she has developed a strong passion for tech news, artificial intelligence, and cybersecurity. When she\u2019s not writing, Andrea enjoys hiking and connecting with nature, spending time with friends, and watching movies and TV shows.","url":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/author\/andrea-miliani\/"},{"@type":"Question","@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875892215","position":1,"url":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875892215","name":"IP\u30a2\u30c9\u30ec\u30b9\u3068\u306f\uff1f","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"IP\u30a2\u30c9\u30ec\u30b9\u3068\u306f\u3001\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3001\u30bf\u30d6\u30ec\u30c3\u30c8\u3001\u5bb6\u5ead\u7528\u30eb\u30fc\u30bf\u30fc\u306a\u3069\u306e\u6a5f\u5668\u3092\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u3067\u8b58\u5225\u3059\u308b\u305f\u3081\u306e<a href=\"#ThePrinciples\">\u4e00\u610f\u306e\u8b58\u5225\u756a\u53f7<\/a>\u306e\u3053\u3068\u3067\u3059\u3002IP\u30a2\u30c9\u30ec\u30b9\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u3084\u305d\u306e\u4ed6\u306e\u30c7\u30d0\u30a4\u30b9\u306f\u901a\u4fe1\u30c7\u30fc\u30bf\u3092\u6b63\u3057\u304f\u3084\u308a\u53d6\u308a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br\/><br\/>","inLanguage":"ja"},"inLanguage":"ja"},{"@type":"Question","@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875905189","position":2,"url":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875905189","name":"IP\u30a2\u30c9\u30ec\u30b9\u306f\u3001\u3044\u304f\u3064\u306e\u30af\u30e9\u30b9\u306b\u5206\u985e\u3055\u308c\u307e\u3059\u304b\uff1f","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"IPv4\u30a2\u30c9\u30ec\u30b9\u306f<a href=\"#The5Classes\">A\u3001B\u3001C\u3001D\u3001E\u306e5\u3064\u306e\u30af\u30e9\u30b9\u306b\u5206\u985e\u3055\u308c\u307e\u3059<\/a>\u3002\u30af\u30e9\u30b9A\u3001B\u3001C\u306f\u5f93\u6765\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3084\u30c7\u30d0\u30a4\u30b9\u306e\u30a2\u30c9\u30ec\u30b9\u6307\u5b9a\u306b\u4f7f\u7528\u3055\u308c\u308b\u306e\u306b\u5bfe\u3057\u3001\u30af\u30e9\u30b9D\u304a\u3088\u3073E\u306f\u7279\u5b9a\u306e\u4e88\u7d04\u9818\u57df\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br\/><br\/>","inLanguage":"ja"},"inLanguage":"ja"},{"@type":"Question","@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875917315","position":3,"url":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875917315","name":"IP\u30a2\u30c9\u30ec\u30b9\u306e\u5404\u30af\u30e9\u30b9\u3068\u7bc4\u56f2\u306e\u4ed5\u7d44\u307f\u3068\u306f\uff1f","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"IP\u30a2\u30c9\u30ec\u30b9\u306e\u30af\u30e9\u30b9\u306f\u3001<a href=\"#The5Classes\">\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u898f\u6a21\u3084\u76ee\u7684\u306b\u57fa\u3065\u3044\u3066IPv4\u30a2\u30c9\u30ec\u30b9\u3092\u30b0\u30eb\u30fc\u30d7\u5206\u3051\u3059\u308b\u3082\u306e\u3067\u3059<\/a>\u3002\u30af\u30e9\u30b9A\u306f\u5927\u898f\u6a21\u7d44\u7e54\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5411\u3051\u3001\u30af\u30e9\u30b9B\u306f\u4e2d\u898f\u6a21\u7d44\u7e54\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5411\u3051\u3001\u30af\u30e9\u30b9C\u306f\u4e00\u822c\u5bb6\u5ead\u3084\u5c0f\u898f\u6a21\u306a\u4e8b\u696d\u5411\u3051\u306b\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30af\u30e9\u30b9D\u306f\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u901a\u4fe1\u3092\u51e6\u7406\u3057\u3001\u30af\u30e9\u30b9E\u306f\u5b9f\u9a13\u7684\u306a\u7528\u9014\u306e\u305f\u3081\u306b\u4e88\u7d04\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u5404\u30af\u30e9\u30b9\u306f\u7279\u5b9a\u306eIP\u30a2\u30c9\u30ec\u30b9\u306e\u6570\u5024\u7bc4\u56f2\u3092\u4f7f\u7528\u3057\u3066\u304a\u308a\u3001\u5404\u30a2\u30c9\u30ec\u30b9\uff08\u30c7\u30d0\u30a4\u30b9\uff09\u304c\u3069\u306e\u898f\u6a21\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u5c5e\u3057\u3066\u3044\u308b\u304b\u3092\u8b58\u5225\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<br\/><br\/>","inLanguage":"ja"},"inLanguage":"ja"},{"@type":"Question","@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875931361","position":4,"url":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875931361","name":"\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u3068\u306f\uff1f","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<a href=\"#PrivateIPAddresses\">\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9<\/a>\u30af\u30e9\u30b9\u3068\u306f\u3001\u30af\u30e9\u30b9A\u3001B\u3001C\u306b\u5c5e\u3059\u308b\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7528\u306b\u4e88\u7d04\u3055\u308c\u305fIP\u30a2\u30c9\u30ec\u30b9\u306e\u30d6\u30ed\u30c3\u30af\u3092\u6307\u3057\u307e\u3059\u3002\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9\u306f\u3001\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3084\u30af\u30e9\u30a6\u30c9\u4e0a\u306e\u5185\u90e8\u901a\u4fe1\u306b\u4f7f\u7528\u3055\u308c\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3068\u901a\u4fe1\u3059\u308b\u306b\u306f\u30d1\u30d6\u30ea\u30c3\u30af\uff08\u30b0\u30ed\u30fc\u30d0\u30eb\uff09IP\u30a2\u30c9\u30ec\u30b9\u306b\u5909\u63db\u3059\u308b\u51e6\u7406\u304c\u767a\u751f\u3057\u307e\u3059\u3002<br\/><br\/>","inLanguage":"ja"},"inLanguage":"ja"},{"@type":"Question","@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875943732","position":5,"url":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875943732","name":"\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u304a\u3051\u308bIP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u306e\u5f79\u5272\u3068\u306f\uff1f","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<a href=\"#The5Classes\">IP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9<\/a>\u306f\u901a\u4fe1\u3068\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u7c21\u7d20\u5316\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u6700\u521d\u306e\u30aa\u30af\u30c6\u30c3\u30c8\u306b\u57fa\u3065\u3044\u3066IP\u30a2\u30c9\u30ec\u30b9\u3092\u30af\u30e9\u30b9\u5206\u3051\u3059\u308b\u3053\u3068\u3067\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u898f\u6a21\u3084\u7528\u9014\u3092\u7c21\u5358\u306b\u8b58\u5225\u3067\u304d\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u52b9\u7387\u304c\u5411\u4e0a\u3057\u3001\u7d44\u7e54\u306e\u30cb\u30fc\u30ba\u306b\u5fdc\u3058\u3066\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u62e1\u5f35\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<br\/><br\/>","inLanguage":"ja"},"inLanguage":"ja"},{"@type":"Question","@id":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875956057","position":6,"url":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/ip-address-classes\/#faq-question-1779875956057","name":"VPN\u306fIP\u30a2\u30c9\u30ec\u30b9\u30af\u30e9\u30b9\u3092\u5909\u66f4\u3057\u305f\u308a\u3001\u96a0\u3057\u305f\u308a\u3067\u304d\u307e\u3059\u304b\uff1f","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<a href=\"https:\/\/www.privateinternetaccess.com\/ja\/what-is-vpn\">VPN<\/a>\u3092\u4f7f\u3046\u3068VPN\u30b5\u30fc\u30d0\u30fc\u304b\u3089IP\u30a2\u30c9\u30ec\u30b9\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u3001\u5b9f\u969b\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u96a0\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u306b\u306fVPN\u30b5\u30fc\u30d0\u30fc\u306e\u30d1\u30d6\u30ea\u30c3\u30afIP\u30a2\u30c9\u30ec\u30b9\u304c\u8868\u793a\u3055\u308c\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u306a\u304a\u3001VPN\u30b5\u30fc\u30d3\u30b9\u3084\u63a5\u7d9a\u3059\u308b\u30b5\u30fc\u30d0\u30fc\u306b\u3088\u3063\u3066\u306f\u3001\u5b9f\u969b\u3068\u306f\u7570\u306a\u308b\u30af\u30e9\u30b9\u306eIP\u30a2\u30c9\u30ec\u30b9\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u307e\u3059\u3002<br\/><br\/>","inLanguage":"ja"},"inLanguage":"ja"}]}},"_links":{"self":[{"href":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/wp-json\/wp\/v2\/posts\/40902","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/wp-json\/wp\/v2\/users\/151"}],"replies":[{"embeddable":true,"href":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/wp-json\/wp\/v2\/comments?post=40902"}],"version-history":[{"count":3,"href":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/wp-json\/wp\/v2\/posts\/40902\/revisions"}],"predecessor-version":[{"id":40964,"href":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/wp-json\/wp\/v2\/posts\/40902\/revisions\/40964"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/wp-json\/wp\/v2\/media\/40901"}],"wp:attachment":[{"href":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/wp-json\/wp\/v2\/media?parent=40902"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/wp-json\/wp\/v2\/categories?post=40902"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.privateinternetaccess.com\/ja\/blog\/wp-json\/wp\/v2\/tags?post=40902"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}