{"id":476223,"date":"2023-08-09T07:26:52","date_gmt":"2023-08-09T07:26:52","guid":{"rendered":""},"modified":"2023-09-05T11:12:17","modified_gmt":"2023-09-05T11:12:17","slug":"cidr","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/jp\/wiki\/cidr\/","title":{"rendered":"CIDR"},"content":{"rendered":"<p>\u30af\u30e9\u30b9\u30ec\u30b9 \u30a4\u30f3\u30bf\u30fc\u30c9\u30e1\u30a4\u30f3 \u30eb\u30fc\u30c6\u30a3\u30f3\u30b0 (CIDR) \u306f\u3001IP \u30a2\u30c9\u30ec\u30b9\u3092\u3088\u308a\u52b9\u7387\u7684\u306b\u5272\u308a\u5f53\u3066\u3001\u7ba1\u7406\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u9769\u65b0\u7684\u306a\u30b7\u30b9\u30c6\u30e0\u3067\u3059\u3002CIDR \u306f\u3001\u65e7\u5f0f\u306e\u30af\u30e9\u30b9\u30d5\u30eb IP \u30a2\u30c9\u30ec\u30b9\u6307\u5b9a\u30b9\u30ad\u30fc\u30e0\u306b\u4ee3\u308f\u308b\u3082\u306e\u3067\u3001\u5229\u7528\u53ef\u80fd\u306a IP \u30a2\u30c9\u30ec\u30b9\u7a7a\u9593\u3092\u3088\u308a\u6709\u52b9\u306b\u6d3b\u7528\u3057\u3001\u3088\u308a\u67d4\u8edf\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a2d\u8a08\u3092\u53ef\u80fd\u306b\u3057\u307e\u3059\u3002\u53ef\u5909\u9577\u306e\u30b5\u30d6\u30cd\u30c3\u30c8 \u30de\u30b9\u30af\u3092\u8a31\u53ef\u3059\u308b\u3053\u3068\u3067\u3001CIDR \u306f\u3055\u307e\u3056\u307e\u306a\u30b5\u30a4\u30ba\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u4f5c\u6210\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3001IP \u30a2\u30c9\u30ec\u30b9\u306e\u7121\u99c4\u3092\u6e1b\u3089\u3057\u307e\u3059\u3002<\/p>\n<h2>CIDR \u306e\u8d77\u6e90\u3068\u305d\u306e\u6700\u521d\u306e\u8a00\u53ca\u306e\u6b74\u53f2<\/h2>\n<p>CIDR \u306f\u3001\u5229\u7528\u53ef\u80fd\u306a IPv4 \u30a2\u30c9\u30ec\u30b9\u306e\u67af\u6e07\u3078\u306e\u5bfe\u5fdc\u3068\u3057\u3066 1990 \u5e74\u4ee3\u521d\u982d\u306b\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\u5f93\u6765\u306e\u30af\u30e9\u30b9\u30d5\u30eb IP \u30a2\u30c9\u30ec\u30b9\u6307\u5b9a\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u56fa\u5b9a\u9577\u306e\u30b5\u30d6\u30cd\u30c3\u30c8 \u30de\u30b9\u30af\u304c\u4f7f\u7528\u3055\u308c\u3066\u3044\u305f\u305f\u3081\u3001IP \u30a2\u30c9\u30ec\u30b9 \u30d6\u30ed\u30c3\u30af\u306e\u5272\u308a\u5f53\u3066\u304c\u975e\u52b9\u7387\u7684\u3067\u3057\u305f\u3002\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u304c\u6025\u6fc0\u306b\u6210\u9577\u3059\u308b\u306b\u3064\u308c\u3066\u3001IPv4 \u30a2\u30c9\u30ec\u30b9\u306e\u67af\u6e07\u3092\u56de\u907f\u3059\u308b\u305f\u3081\u306b\u65b0\u3057\u3044\u30a2\u30c9\u30ec\u30b9\u6307\u5b9a\u30b9\u30ad\u30fc\u30e0\u304c\u5fc5\u8981\u3067\u3042\u308b\u3053\u3068\u304c\u660e\u3089\u304b\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>CIDR \u306e\u6700\u521d\u306e\u63d0\u6848\u306f\u3001Yogen Dalal \u6c0f\u3068 Craig Partridge \u6c0f\u304c\u7387\u3044\u308b\u30b9\u30bf\u30f3\u30d5\u30a9\u30fc\u30c9\u5927\u5b66\u306e\u30a8\u30f3\u30b8\u30cb\u30a2 \u30c1\u30fc\u30e0\u306b\u3088\u3063\u3066\u30011993 \u5e74\u306b\u767a\u8868\u3055\u308c\u305f\u300cA Border Gateway Protocol 4 (BGP-4)\u300d\u3068\u3044\u3046\u753b\u671f\u7684\u306a\u8ad6\u6587\u3067\u767a\u8868\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u8ad6\u6587\u3067\u306f CIDR \u306e\u6982\u5ff5\u304c\u6982\u8aac\u3055\u308c\u3001\u3059\u3050\u306b\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u6280\u8853\u30bf\u30b9\u30af \u30d5\u30a9\u30fc\u30b9 (IETF) \u306b\u63a1\u7528\u3055\u308c\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306e\u6210\u9577\u306b\u4e0d\u53ef\u6b20\u306a\u8981\u7d20\u3068\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<h2>CIDR \u306b\u95a2\u3059\u308b\u8a73\u7d30\u60c5\u5831 \u2013 \u30c8\u30d4\u30c3\u30af CIDR \u306e\u62e1\u5f35<\/h2>\n<p>CIDR \u306f\u3001IP \u30a2\u30c9\u30ec\u30b9\u306e\u5272\u308a\u5f53\u3066\u3068\u30b5\u30d6\u30cd\u30c3\u30c8\u5316\u306e\u65b9\u6cd5\u3092\u6839\u672c\u7684\u306b\u5909\u66f4\u3057\u307e\u3059\u3002\u53ef\u5909\u9577\u30b5\u30d6\u30cd\u30c3\u30c8 \u30de\u30b9\u30af\u306e\u6982\u5ff5\u304c\u5c0e\u5165\u3055\u308c\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7ba1\u7406\u8005\u306f IP \u30a2\u30c9\u30ec\u30b9\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u90e8\u5206\u306b\u4efb\u610f\u306e\u6570\u306e\u30d3\u30c3\u30c8\u3092\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u67d4\u8edf\u6027\u306b\u3088\u308a\u3001\u5b9f\u969b\u306e\u30cb\u30fc\u30ba\u306b\u57fa\u3065\u3044\u3066 IP \u30a2\u30c9\u30ec\u30b9 \u30d6\u30ed\u30c3\u30af\u3092\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u304c\u5bb9\u6613\u306b\u306a\u308a\u3001\u5c0f\u898f\u6a21\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u5927\u304d\u306a\u30a2\u30c9\u30ec\u30b9\u7bc4\u56f2\u3092\u7121\u99c4\u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u304c\u306a\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>CIDR \u8868\u8a18\u3067\u306f\u3001IP \u30a2\u30c9\u30ec\u30b9\u306e\u5f8c\u306b\u30b9\u30e9\u30c3\u30b7\u30e5\u3068\u6570\u5b57\u304c\u7d9a\u304d\u307e\u3059 (\u4f8b: 192.168.1.0\/24)\u3002\u30b9\u30e9\u30c3\u30b7\u30e5\u306e\u5f8c\u306e\u6570\u5b57\u306f\u3001\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u9577\u3001\u3064\u307e\u308a\u30a2\u30c9\u30ec\u30b9\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u90e8\u5206\u306e\u30d3\u30c3\u30c8\u6570\u3092\u8868\u3057\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\/24 \u306f\u3001\u30a2\u30c9\u30ec\u30b9\u306e\u6700\u521d\u306e 24 \u30d3\u30c3\u30c8\u304c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u4f7f\u7528\u3055\u308c\u300132 - 24 = 8 \u30d3\u30c3\u30c8\u304c\u30db\u30b9\u30c8 \u30a2\u30c9\u30ec\u30b9\u306b\u4f7f\u7528\u3055\u308c\u30012^8 = 256 \u500b\u306e\u30db\u30b9\u30c8\u304c\u4f7f\u7528\u53ef\u80fd\u306b\u306a\u308b\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<h2>CIDR \u306e\u5185\u90e8\u69cb\u9020 \u2013 CIDR \u306e\u4ed5\u7d44\u307f<\/h2>\n<p>CIDR \u306f\u3001IP \u30a2\u30c9\u30ec\u30b9 \u30d6\u30ed\u30c3\u30af\u306e\u96c6\u7d04\u3092\u5229\u7528\u3057\u3066\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0 \u30c6\u30fc\u30d6\u30eb\u306e\u30b5\u30a4\u30ba\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u52b9\u7387\u3092\u5411\u4e0a\u3055\u305b\u307e\u3059\u3002\u500b\u3005\u306e IP \u30a2\u30c9\u30ec\u30b9\u7bc4\u56f2\u3092\u30a2\u30c9\u30d0\u30bf\u30a4\u30ba\u3059\u308b\u4ee3\u308f\u308a\u306b\u3001CIDR \u3067\u306f\u8907\u6570\u306e\u5c0f\u3055\u306a\u30d6\u30ed\u30c3\u30af\u3092 1 \u3064\u306e\u5927\u304d\u306a\u30d6\u30ed\u30c3\u30af\u306b\u96c6\u7d04\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0 \u30c6\u30fc\u30d6\u30eb\u5185\u306e\u30a8\u30f3\u30c8\u30ea\u6570\u304c\u6e1b\u308a\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u6c7a\u5b9a\u304c\u901f\u304f\u306a\u308a\u3001\u5e2f\u57df\u5e45\u3092\u3088\u308a\u52b9\u7387\u7684\u306b\u4f7f\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>CIDR \u306e\u6839\u5e95\u306b\u3042\u308b\u8003\u3048\u65b9\u306f\u3001\u8907\u6570\u306e\u9023\u7d9a\u3057\u305f IP \u30a2\u30c9\u30ec\u30b9 \u30d6\u30ed\u30c3\u30af\u3092 1 \u3064\u306e\u5927\u304d\u306a\u30d6\u30ed\u30c3\u30af\u306b\u307e\u3068\u3081\u308b\u96c6\u7d04\u3067\u3059\u3002\u96c6\u7d04\u3055\u308c\u305f\u30d6\u30ed\u30c3\u30af\u306e\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u60c5\u5831\u306f\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u5168\u4f53\u306b\u30a2\u30c9\u30d0\u30bf\u30a4\u30ba\u3055\u308c\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0 \u30c6\u30fc\u30d6\u30eb\u306e\u30b5\u30a4\u30ba\u304c\u7e2e\u5c0f\u3055\u308c\u307e\u3059\u3002\u96c6\u7d04\u3055\u308c\u305f\u30d6\u30ed\u30c3\u30af\u5185\u306e IP \u30a2\u30c9\u30ec\u30b9\u306b\u30d1\u30b1\u30c3\u30c8\u3092\u914d\u4fe1\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3001\u30eb\u30fc\u30bf\u30fc\u306f\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u3092\u5b9f\u884c\u3057\u3001\u96c6\u7d04\u3055\u308c\u305f\u30eb\u30fc\u30c8\u306b\u57fa\u3065\u3044\u3066\u30d1\u30b1\u30c3\u30c8\u3092\u8ee2\u9001\u3057\u307e\u3059\u3002<\/p>\n<h2>CIDR \u306e\u4e3b\u306a\u6a5f\u80fd\u306e\u5206\u6790<\/h2>\n<p>CIDR \u306f\u3001IP \u30a2\u30c9\u30ec\u30b9\u7ba1\u7406\u306b\u4e0d\u53ef\u6b20\u306a\u30c6\u30af\u30ce\u30ed\u30b8\u30fc\u3068\u306a\u308b\u3044\u304f\u3064\u304b\u306e\u91cd\u8981\u306a\u6a5f\u80fd\u3092\u5099\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n<ol>\n<li>\n<p><strong>\u30a2\u30c9\u30ec\u30b9\u7a7a\u9593\u52b9\u7387:<\/strong> CIDR \u306f\u3001\u5b9f\u969b\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af \u30b5\u30a4\u30ba\u8981\u4ef6\u306b\u57fa\u3065\u3044\u3066\u30a2\u30c9\u30ec\u30b9\u3092\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u306b\u3088\u308a\u3001IP \u30a2\u30c9\u30ec\u30b9\u7a7a\u9593\u306e\u5229\u7528\u7387\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3055\u305b\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u30eb\u30fc\u30c8\u96c6\u7d04:<\/strong> CIDR \u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u8907\u6570\u306e\u5c0f\u3055\u306a IP \u30a2\u30c9\u30ec\u30b9 \u30d6\u30ed\u30c3\u30af\u3092\u5927\u304d\u306a\u30d6\u30ed\u30c3\u30af\u306b\u96c6\u7d04\u3057\u3066\u3001\u30b0\u30ed\u30fc\u30d0\u30eb \u30eb\u30fc\u30c6\u30a3\u30f3\u30b0 \u30c6\u30fc\u30d6\u30eb\u306e\u30b5\u30a4\u30ba\u3092\u7e2e\u5c0f\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u7c21\u7d20\u5316\u3055\u308c\u305f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a2d\u8a08:<\/strong> CIDR \u306f\u3001\u53ef\u5909\u9577\u306e\u30b5\u30d6\u30cd\u30c3\u30c8 \u30de\u30b9\u30af\u3092\u8a31\u53ef\u3059\u308b\u3053\u3068\u3067\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u8a2d\u8a08\u3068\u7ba1\u7406\u3092\u7c21\u7d20\u5316\u3057\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a2d\u8a08\u306e\u67d4\u8edf\u6027\u3092\u9ad8\u3081\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3:<\/strong> CIDR \u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306f\u3088\u308a\u52b9\u7387\u7684\u306b\u62e1\u5f35\u3067\u304d\u3001\u5897\u3048\u7d9a\u3051\u308b\u63a5\u7d9a\u30c7\u30d0\u30a4\u30b9\u306b\u5bfe\u5fdc\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u3088\u308a\u30b9\u30e0\u30fc\u30ba\u306a\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0:<\/strong> CIDR \u306f\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0 \u30c6\u30fc\u30d6\u30eb\u306e\u30a8\u30f3\u30c8\u30ea\u6570\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u3053\u3068\u3067\u30eb\u30fc\u30bf\u30fc\u306e\u8ca0\u62c5\u3092\u8efd\u6e1b\u3057\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u6c7a\u5b9a\u3092\u9ad8\u901f\u5316\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<\/ol>\n<h2>CIDR \u306e\u7a2e\u985e<\/h2>\n<p>CIDR \u306f\u3001IP \u30a2\u30c9\u30ec\u30b9 \u30d6\u30ed\u30c3\u30af\u306e\u30b5\u30a4\u30ba\u306b\u57fa\u3065\u3044\u3066\u4e3b\u306b 3 \u3064\u306e\u30bf\u30a4\u30d7\u306b\u5206\u985e\u3055\u308c\u307e\u3059\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>CIDR \u8868\u8a18<\/th>\n<th>\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u9577<\/th>\n<th>\u30db\u30b9\u30c8\u6570<\/th>\n<th>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\/24<\/td>\n<td>24\u30d3\u30c3\u30c8<\/td>\n<td>256<\/td>\n<td>255.255.255.0<\/td>\n<\/tr>\n<tr>\n<td>\/16<\/td>\n<td>16\u30d3\u30c3\u30c8<\/td>\n<td>65,536<\/td>\n<td>255.255.0.0<\/td>\n<\/tr>\n<tr>\n<td>\/8<\/td>\n<td>8\u30d3\u30c3\u30c8<\/td>\n<td>16,777,216<\/td>\n<td>255.0.0.0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>CIDR\u306e\u4f7f\u3044\u65b9\u3001\u4f7f\u7528\u306b\u4f34\u3046\u554f\u984c\u3068\u89e3\u6c7a\u7b56<\/h2>\n<p>CIDR \u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u3055\u307e\u3056\u307e\u306a\u5074\u9762\u3067\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<ol>\n<li>\n<p><strong>\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8 \u30b5\u30fc\u30d3\u30b9 \u30d7\u30ed\u30d0\u30a4\u30c0\u30fc (ISP):<\/strong> ISP \u306f CIDR \u3092\u4f7f\u7528\u3057\u3066\u3001\u9867\u5ba2\u3084\u30d4\u30a2\u306b IP \u30a2\u30c9\u30ec\u30b9 \u30d6\u30ed\u30c3\u30af\u3092\u52b9\u7387\u7684\u306b\u5272\u308a\u5f53\u3066\u3001\u30b0\u30ed\u30fc\u30d0\u30eb IP \u30a2\u30c9\u30ec\u30b9 \u30d7\u30fc\u30eb\u306e\u8ca0\u62c5\u3092\u8efd\u6e1b\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af:<\/strong> \u4f01\u696d\u3084\u7d44\u7e54\u306f\u3001CIDR \u3092\u4f7f\u7528\u3057\u3066\u3001IP \u30a2\u30c9\u30ec\u30b9\u3092\u6700\u9069\u306b\u5229\u7528\u3057\u305f\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8 \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u8a2d\u8a08\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u30b5\u30d6\u30cd\u30c3\u30c8\u5316:<\/strong> CIDR \u3092\u4f7f\u7528\u3059\u308b\u3068\u30b5\u30d6\u30cd\u30c3\u30c8\u5316\u304c\u5bb9\u6613\u306b\u306a\u308a\u3001\u7ba1\u7406\u8005\u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u3088\u308a\u5c0f\u3055\u304f\u7ba1\u7406\u3057\u3084\u3059\u3044\u30b5\u30d6\u30cd\u30c3\u30c8\u306b\u5206\u5272\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<\/li>\n<\/ol>\n<p>CIDR \u306e\u5b9f\u88c5\u306b\u306f\u5229\u70b9\u304c\u3042\u308b\u3082\u306e\u306e\u3001\u6b21\u306e\u3088\u3046\u306a\u8ab2\u984c\u306b\u76f4\u9762\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\n<p><strong>\u8aa4\u3063\u305f\u8a2d\u5b9a:<\/strong> \u4e0d\u9069\u5207\u306a CIDR \u8868\u8a18\u307e\u305f\u306f\u96c6\u7d04\u306f\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u554f\u984c\u3084\u63a5\u7d9a\u306e\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u4e0d\u5b89\u5b9a\u6027:<\/strong> \u30eb\u30fc\u30c8\u96c6\u7d04\u304c\u6b63\u3057\u304f\u306a\u3044\u3068\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u304c\u4e0d\u5b89\u5b9a\u306b\u306a\u308a\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5f71\u97ff\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>IP \u30a2\u30c9\u30ec\u30b9\u67af\u6e07:<\/strong> CIDR \u306f IPv4 \u30a2\u30c9\u30ec\u30b9\u306e\u67af\u6e07\u3092\u9045\u3089\u305b\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u304c\u3001\u4e16\u754c\u306f\u9577\u671f\u7684\u306a IP \u30a2\u30c9\u30ec\u30b9\u4e0d\u8db3\u306b\u5bfe\u51e6\u3059\u308b\u305f\u3081\u306b IPv6 \u306e\u5c0e\u5165\u306b\u5411\u3051\u3066\u6025\u901f\u306b\u52d5\u3044\u3066\u3044\u307e\u3059\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306e\u554f\u984c\u306b\u5bfe\u51e6\u3059\u308b\u306b\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7ba1\u7406\u8005\u306f CIDR \u5272\u308a\u5f53\u3066\u3092\u614e\u91cd\u306b\u8a08\u753b\u3057\u3001\u30eb\u30fc\u30c8\u96c6\u7d04\u3092\u691c\u8a3c\u3057\u3001\u9577\u671f\u7684\u306a\u6301\u7d9a\u53ef\u80fd\u6027\u306e\u305f\u3081\u306b IPv6 \u3078\u306e\u79fb\u884c\u3092\u691c\u8a0e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>\u4e3b\u306a\u7279\u5fb4\u3068\u985e\u4f3c\u7528\u8a9e\u3068\u306e\u6bd4\u8f03<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u5b66\u671f<\/th>\n<th>\u8aac\u660e<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u30af\u30e9\u30b9\u30d5\u30eb\u30a2\u30c9\u30ec\u30b9\u6307\u5b9a<\/td>\n<td>\u56fa\u5b9a\u30de\u30b9\u30af\u3092\u4f7f\u7528\u3057\u3066\u30a2\u30c9\u30ec\u30b9\u3092\u30af\u30e9\u30b9 (A\u3001B\u3001C\u3001D\u3001E) \u306b\u5206\u5272\u3059\u308b\u5f93\u6765\u306e IP \u30a2\u30c9\u30ec\u30b9\u6307\u5b9a\u65b9\u5f0f\u3002<\/td>\n<\/tr>\n<tr>\n<td>\u30b5\u30d6\u30cd\u30c3\u30c8\u5316<\/td>\n<td>\u7ba1\u7406\u3068\u52b9\u7387\u3092\u5411\u4e0a\u3055\u305b\u308b\u305f\u3081\u306b\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u3088\u308a\u5c0f\u3055\u306a\u30b5\u30d6\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u5206\u5272\u3059\u308b\u30d7\u30ed\u30bb\u30b9\u3002<\/td>\n<\/tr>\n<tr>\n<td>\u30b9\u30fc\u30d1\u30fc\u30cd\u30c3\u30c6\u30a3\u30f3\u30b0<\/td>\n<td>\u30b5\u30d6\u30cd\u30c3\u30c8\u5316\u306e\u53cd\u5bfe\u3067\u3001\u8907\u6570\u306e\u5c0f\u3055\u306a IP \u30a2\u30c9\u30ec\u30b9 \u30d6\u30ed\u30c3\u30af\u304c 1 \u3064\u306e\u5927\u304d\u306a\u30d6\u30ed\u30c3\u30af\u306b\u96c6\u7d04\u3055\u308c\u307e\u3059\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>CIDR\u306b\u95a2\u3059\u308b\u4eca\u5f8c\u306e\u5c55\u671b\u3068\u6280\u8853<\/h2>\n<p>IPv4 \u30a2\u30c9\u30ec\u30b9\u306e\u67af\u6e07\u3068\u3044\u3046\u8ab2\u984c\u306b\u76f4\u9762\u3057\u7d9a\u3051\u308b\u4e2d\u3001CIDR \u306f\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8 \u30a4\u30f3\u30d5\u30e9\u30b9\u30c8\u30e9\u30af\u30c1\u30e3\u306e\u91cd\u8981\u306a\u90e8\u5206\u3067\u3042\u308a\u7d9a\u3051\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u5c06\u6765\u7684\u306b\u306f\u3001\u81a8\u5927\u306a\u30a2\u30c9\u30ec\u30b9\u7a7a\u9593\u3092\u63d0\u4f9b\u3057\u3001\u8907\u96d1\u306a CIDR \u8a08\u7b97\u306e\u5fc5\u8981\u6027\u3092\u6392\u9664\u3059\u308b IPv6 \u306e\u666e\u53ca\u304c\u671f\u5f85\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>IPv6 \u3067\u306f\u7d04 340 \u5146\u500b\u306e\u56fa\u6709\u306e IP \u30a2\u30c9\u30ec\u30b9\u304c\u63d0\u4f9b\u3055\u308c\u308b\u305f\u3081\u3001\u4eca\u5f8c\u6570\u4e16\u4ee3\u306b\u308f\u305f\u3063\u3066 IP \u30a2\u30c9\u30ec\u30b9\u306e\u67af\u6e07\u304c\u554f\u984c\u306b\u306a\u308b\u3053\u3068\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u3002IPv6 \u3078\u306e\u79fb\u884c\u306f\u9032\u884c\u4e2d\u3067\u3042\u308a\u3001\u3053\u306e\u65b0\u3057\u3044\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u63a1\u7528\u3059\u308b\u30c7\u30d0\u30a4\u30b9\u3084\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u304c\u5897\u3048\u308b\u306b\u3064\u308c\u3066\u3001IPv4 \u30a2\u30c9\u30ec\u30b9\u7ba1\u7406\u306b\u304a\u3051\u308b CIDR \u3078\u306e\u4f9d\u5b58\u306f\u5f90\u3005\u306b\u6e1b\u5c11\u3057\u307e\u3059\u3002<\/p>\n<h2>\u30d7\u30ed\u30ad\u30b7 \u30b5\u30fc\u30d0\u30fc\u3092 CIDR \u3067\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u307e\u305f\u306f CIDR \u3068\u95a2\u9023\u4ed8\u3051\u308b\u65b9\u6cd5<\/h2>\n<p>OneProxy \u304c\u63d0\u4f9b\u3059\u308b\u3088\u3046\u306a\u30d7\u30ed\u30ad\u30b7 \u30b5\u30fc\u30d0\u30fc\u3092 CIDR \u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u4f7f\u7528\u3059\u308b\u3068\u3001\u30d7\u30e9\u30a4\u30d0\u30b7\u30fc\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5f37\u5316\u3067\u304d\u307e\u3059\u3002\u30d7\u30ed\u30ad\u30b7 \u30b5\u30fc\u30d0\u30fc\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3068\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u9593\u306e\u4ef2\u4ecb\u5f79\u3068\u3057\u3066\u6a5f\u80fd\u3057\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u4ee3\u308f\u3063\u3066\u8981\u6c42\u3092\u8ee2\u9001\u3057\u3001\u5fdc\u7b54\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>CIDR \u306f\u3001\u30d7\u30ed\u30ad\u30b7 \u30b5\u30fc\u30d0\u30fc\u306e\u69cb\u6210\u3067 IP \u30a2\u30c9\u30ec\u30b9\u7bc4\u56f2\u3092\u52b9\u7387\u7684\u306b\u7ba1\u7406\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002CIDR \u8868\u8a18\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30d7\u30ed\u30ad\u30b7 \u30b5\u30fc\u30d0\u30fc \u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306f\u3001\u30d7\u30ed\u30ad\u30b7\u3092\u4ecb\u3057\u3066\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3059\u308b IP \u30a2\u30c9\u30ec\u30b9 \u30d6\u30ed\u30c3\u30af\u3092\u6307\u5b9a\u3057\u3001\u30a2\u30af\u30bb\u30b9\u3092\u5236\u5fa1\u3057\u3066\u3001\u7279\u5b9a\u306e\u5730\u57df\u307e\u305f\u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001\u30d7\u30ed\u30ad\u30b7 \u30b5\u30fc\u30d0\u30fc\u306f\u3001CIDR \u30d9\u30fc\u30b9\u306e\u30eb\u30fc\u30eb\u306b\u57fa\u3065\u3044\u3066\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u3055\u307e\u3056\u307e\u306a\u30b5\u30fc\u30d0\u30fc\u306b\u30a4\u30f3\u30c6\u30ea\u30b8\u30a7\u30f3\u30c8\u306b\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3059\u308b\u3053\u3068\u3067\u3001\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u5206\u6563\u3057\u3001\u8ca0\u8377\u5206\u6563\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30d7\u30ed\u30ad\u30b7 \u30b5\u30fc\u30d0\u30fc \u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u304c\u63d0\u4f9b\u3059\u308b\u30b5\u30fc\u30d3\u30b9\u306e\u52b9\u7387\u3068\u4fe1\u983c\u6027\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002<\/p>\n<h2>\u95a2\u9023\u30ea\u30f3\u30af<\/h2>\n<p>CIDR \u3068\u305d\u306e\u5b9f\u88c5\u306e\u8a73\u7d30\u306b\u3064\u3044\u3066\u306f\u3001\u6b21\u306e\u30ea\u30bd\u30fc\u30b9\u304c\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<ol>\n<li><a href=\"https:\/\/tools.ietf.org\/html\/rfc4632\" target=\"_new\" rel=\"noopener nofollow\">RFC 4632 \u2013 \u30af\u30e9\u30b9\u30ec\u30b9\u30c9\u30e1\u30a4\u30f3\u9593\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0 (CIDR)<\/a><\/li>\n<li><a href=\"https:\/\/www.cisco.com\/c\/en\/us\/support\/docs\/ip\/routing-information-protocol-rip\/13788-3.html\" target=\"_new\" rel=\"noopener nofollow\">IP \u30a2\u30c9\u30ec\u30b9\u3068 CIDR \u3092\u7406\u89e3\u3059\u308b<\/a><\/li>\n<li><a href=\"https:\/\/www.arin.net\/resources\/registry\/ipv6\/introduction\/\" target=\"_new\" rel=\"noopener nofollow\">IPv6 \u306e\u6982\u8981<\/a><\/li>\n<li><a href=\"https:\/\/oneproxy.pro\/jp\/blog\/proxy-servers-and-their-benefits\/\" target=\"_new\" rel=\"noopener\">\u30d7\u30ed\u30ad\u30b7\u30b5\u30fc\u30d0\u30fc\u3068\u305d\u306e\u5229\u70b9<\/a><\/li>\n<\/ol>\n<p>\u7d50\u8ad6\u3068\u3057\u3066\u3001CIDR \u306f IPv4 \u306e\u5bff\u547d\u3092\u5ef6\u3070\u3057\u3001IP \u30a2\u30c9\u30ec\u30b9\u306e\u5272\u308a\u5f53\u3066\u3092\u52b9\u7387\u7684\u306b\u7ba1\u7406\u3059\u308b\u4e0a\u3067\u6975\u3081\u3066\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3066\u304d\u305f\u91cd\u8981\u306a\u30c6\u30af\u30ce\u30ed\u30b8\u30fc\u3067\u3059\u3002\u5c06\u6765\u3092\u898b\u636e\u3048\u308b\u3068\u3001IPv6 \u3078\u306e\u79fb\u884c\u306f\u907f\u3051\u3089\u308c\u307e\u305b\u3093\u304c\u3001CIDR \u306f\u9032\u5316\u3057\u7d9a\u3051\u308b\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u74b0\u5883\u306b\u304a\u3044\u3066\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u8a2d\u8a08\u3068\u7ba1\u7406\u306b\u4e0d\u53ef\u6b20\u306a\u8981\u7d20\u3067\u3042\u308a\u7d9a\u3051\u308b\u3067\u3057\u3087\u3046\u3002<\/p>","protected":false},"featured_media":476224,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-476223","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Classless Inter-Domain Routing (CIDR) - A Comprehensive Guide<\/mark>","faq_items":[{"question":"What is CIDR?","answer":"<p>CIDR stands for Classless Inter-Domain Routing, a system used to allocate and manage IP addresses more efficiently. It replaces the outdated classful IP addressing scheme and allows for variable-length subnet masks, enabling better address space utilization and flexible network design.<\/p>"},{"question":"How did CIDR originate?","answer":"<p>CIDR was introduced in the early 1990s in response to the exhaustion of available IPv4 addresses. The concept was first proposed in a paper titled \"A Border Gateway Protocol 4 (BGP-4)\" by engineers at Stanford University. Soon after, it was adopted by the Internet Engineering Task Force (IETF) and became crucial for internet growth.<\/p>"},{"question":"How does CIDR work?","answer":"<p>CIDR relies on variable-length subnet masks to allocate IP addresses based on actual network size requirements. It allows multiple smaller IP address blocks to be aggregated into larger ones, reducing the size of routing tables and improving routing efficiency.<\/p>"},{"question":"What are the key features of CIDR?","answer":"<p>CIDR offers several benefits, including improved address space efficiency, route aggregation for smaller blocks, simplified network design, scalability, and smoother routing. These features make CIDR an essential technology for IP address management.<\/p>"},{"question":"What types of CIDR exist?","answer":"<p>CIDR is classified based on the prefix length, which determines the size of the IP address block. Some common types include \/24, \/16, and \/8, each with varying numbers of hosts and subnet masks.<\/p>"},{"question":"How is CIDR used, and what are the challenges?","answer":"<p>CIDR is used in various aspects of networking, including ISPs, private networks, and subnetting. However, it can face challenges like misconfiguration, routing instabilities, and IPv4 address exhaustion. Transitioning to IPv6 is a long-term solution to address this concern.<\/p>"},{"question":"How does CIDR relate to the future of networking?","answer":"<p>While CIDR continues to be crucial for managing IPv4 addresses, the future lies in widespread adoption of IPv6, which offers an enormous address space and eliminates the need for complex CIDR calculations.<\/p>"},{"question":"How are proxy servers associated with CIDR?","answer":"<p>Proxy servers can be used with CIDR to enhance privacy, security, and performance. By utilizing CIDR notation, proxy server providers can efficiently manage IP address ranges, control access, and optimize services for specific regions or networks.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/jp\/wp-json\/wp\/v2\/wiki\/476223","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/jp\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/jp\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/jp\/wp-json\/wp\/v2\/wiki\/476223\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/jp\/wp-json\/wp\/v2\/media\/476224"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/jp\/wp-json\/wp\/v2\/media?parent=476223"}],"curies":[{"name":"\u3046\u30fc\u3093","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}