{"id":478113,"date":"2023-08-09T09:27:35","date_gmt":"2023-08-09T09:27:35","guid":{"rendered":""},"modified":"2023-09-05T11:16:08","modified_gmt":"2023-09-05T11:16:08","slug":"netmask","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/jp\/wiki\/netmask\/","title":{"rendered":"\u30cd\u30c3\u30c8\u30de\u30b9\u30af"},"content":{"rendered":"<p>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u30b5\u30d6\u30cd\u30c3\u30c8 \u30de\u30b9\u30af\u3068\u3082\u547c\u3070\u308c\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u57fa\u672c\u7684\u306a\u6982\u5ff5\u3067\u3042\u308a\u3001\u30d7\u30ed\u30ad\u30b7 \u30b5\u30fc\u30d0\u30fc\u306e\u6a5f\u80fd\u306b\u3068\u3063\u3066\u91cd\u8981\u306a\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u3059\u3002IP \u30a2\u30c9\u30ec\u30b9\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u90e8\u5206\u3068\u30db\u30b9\u30c8\u90e8\u5206\u3092\u6c7a\u5b9a\u3059\u308b\u4e0a\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u5883\u754c\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u3001\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u30c7\u30d0\u30a4\u30b9\u3068\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u9593\u306e\u30c7\u30fc\u30bf \u30d1\u30b1\u30c3\u30c8\u306e\u52b9\u7387\u7684\u306a\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u53ef\u80fd\u306b\u3057\u307e\u3059\u3002<\/p>\n<h2>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u8d77\u6e90\u3068\u305d\u306e\u6700\u521d\u306e\u8a00\u53ca\u306e\u6b74\u53f2<\/h2>\n<p>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u6982\u5ff5\u306f\u3001IP \u30a2\u30c9\u30ec\u30b9\u3092\u30bb\u30b0\u30e1\u30f3\u30c8\u5316\u3059\u308b\u5fc5\u8981\u6027\u304c\u660e\u3089\u304b\u306b\u306a\u3063\u305f\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u521d\u671f\u306e\u9803\u306b\u307e\u3067\u9061\u308a\u307e\u3059\u30021981 \u5e74\u306b\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u6280\u8853\u30bf\u30b9\u30af \u30d5\u30a9\u30fc\u30b9 (IETF) \u306f\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8 \u30d7\u30ed\u30c8\u30b3\u30eb \u30d0\u30fc\u30b8\u30e7\u30f3 4 (IPv4) \u3092\u5c0e\u5165\u3057\u3001\u3053\u3053\u3067\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u304c\u300c\u30b5\u30d6\u30cd\u30c3\u30c8 \u30de\u30b9\u30af\u300d\u306e\u5f62\u5f0f\u3067\u521d\u3081\u3066\u6b63\u5f0f\u306b\u5b9a\u7fa9\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7ba1\u7406\u8005\u306f IP \u30a2\u30c9\u30ec\u30b9\u3092\u30cd\u30c3\u30c8\u30ef\u30fc\u30af \u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u3068\u30db\u30b9\u30c8\u8b58\u5225\u5b50\u306e 2 \u3064\u306e\u90e8\u5206\u306b\u5206\u5272\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u3053\u306e\u5206\u5272\u306b\u3088\u308a\u3001IP \u30a2\u30c9\u30ec\u30b9\u306e\u5272\u308a\u5f53\u3066\u304c\u3088\u308a\u52b9\u7387\u7684\u306b\u306a\u308a\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306e\u6210\u9577\u304c\u4fc3\u9032\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<h2>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306b\u95a2\u3059\u308b\u8a73\u7d30\u60c5\u5831: \u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u30c8\u30d4\u30c3\u30af\u306e\u62e1\u5f35<\/h2>\n<p>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u30014 \u3064\u306e\u30aa\u30af\u30c6\u30c3\u30c8\u306e\u5f62\u5f0f\u3067\u8868\u73fe\u3055\u308c\u308b 32 \u30d3\u30c3\u30c8\u306e\u5024\u3067\u3059 (\u4f8b: 255.255.255.0)\u3002\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u5404\u30d3\u30c3\u30c8\u306f IP \u30a2\u30c9\u30ec\u30b9\u306e\u30d3\u30c3\u30c8\u306b\u5bfe\u5fdc\u3057\u3066\u304a\u308a\u3001\u5024 1 \u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u90e8\u5206\u3092\u793a\u3057\u3001\u5024 0 \u306f\u30db\u30b9\u30c8\u90e8\u5206\u3092\u793a\u3057\u307e\u3059\u3002\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u3001IP \u30a2\u30c9\u30ec\u30b9\u3068\u30d3\u30c3\u30c8\u5358\u4f4d\u306e\u8ad6\u7406 AND \u6f14\u7b97\u3092\u5b9f\u884c\u3057\u3066\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af \u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u3092\u52b9\u679c\u7684\u306b\u62bd\u51fa\u3059\u308b\u3053\u3068\u3067\u6a5f\u80fd\u3057\u307e\u3059\u3002<\/p>\n<p>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u6982\u5ff5\u3092\u3088\u308a\u3088\u304f\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u3001\u7c21\u5358\u306a\u4f8b\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002IP \u30a2\u30c9\u30ec\u30b9\u304c 192.168.1.100\u3001\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u304c 255.255.255.0 \u3067\u3042\u308b\u3068\u3057\u307e\u3059\u3002\u3053\u308c\u3089 2 \u3064\u306e\u5024\u306b\u30d3\u30c3\u30c8\u5358\u4f4d\u306e AND \u6f14\u7b97\u3092\u9069\u7528\u3059\u308b\u3068\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af \u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u306f 192.168.1.0 \u306b\u306a\u308a\u307e\u3059\u3002\u6b8b\u308a\u306e\u30d3\u30c3\u30c8 (\u4f8b: .100) \u306f\u30db\u30b9\u30c8\u8b58\u5225\u5b50\u3092\u8868\u3057\u3001\u3053\u308c\u306b\u3088\u308a\u3001\u540c\u3058\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u306e\u30c7\u30d0\u30a4\u30b9\u306f\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u5fc5\u8981\u3068\u305b\u305a\u306b\u76f4\u63a5\u901a\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u5185\u90e8\u69cb\u9020: \u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u4ed5\u7d44\u307f<\/h2>\n<p>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u5185\u90e8\u69cb\u9020\u306f\u30011 \u306b\u8a2d\u5b9a\u3055\u308c\u305f\u56fa\u5b9a\u6570\u306e\u30d3\u30c3\u30c8\u3068\u3001\u305d\u308c\u306b\u7d9a\u304f 0 \u306b\u8a2d\u5b9a\u3055\u308c\u305f\u56fa\u5b9a\u6570\u306e\u30d3\u30c3\u30c8\u3067\u69cb\u6210\u3055\u308c\u307e\u3059\u30021 \u306b\u8a2d\u5b9a\u3055\u308c\u305f\u30d3\u30c3\u30c8\u6570\u306b\u3088\u3063\u3066\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u90e8\u5206\u306e\u30b5\u30a4\u30ba\u304c\u6c7a\u5b9a\u3055\u308c\u30010 \u306b\u8a2d\u5b9a\u3055\u308c\u305f\u30d3\u30c3\u30c8\u6570\u306b\u3088\u3063\u3066\u30db\u30b9\u30c8\u90e8\u5206\u306e\u30b5\u30a4\u30ba\u304c\u5b9a\u7fa9\u3055\u308c\u307e\u3059\u3002\u30cd\u30c3\u30c8\u30ef\u30fc\u30af \u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u306e\u9577\u3055\u306f\u300c\u30b5\u30d6\u30cd\u30c3\u30c8 \u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u9577\u300d\u3068\u547c\u3070\u308c\u3001\u901a\u5e38\u306f CIDR \u8868\u8a18\u6cd5 (\u4f8b: \/24) \u3092\u4f7f\u7528\u3057\u3066\u8868\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u30cd\u30c3\u30c8\u30de\u30b9\u30af 255.255.255.0 \u306f\u30b5\u30d6\u30cd\u30c3\u30c8 \u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u9577 \/24 \u306b\u76f8\u5f53\u3057\u3001IP \u30a2\u30c9\u30ec\u30b9\u306e\u6700\u521d\u306e 24 \u30d3\u30c3\u30c8\u304c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u8868\u3057\u3001\u6700\u5f8c\u306e 8 \u30d3\u30c3\u30c8\u304c\u30db\u30b9\u30c8\u3092\u8868\u3059\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<h2>Netmask \u306e\u4e3b\u306a\u6a5f\u80fd\u306e\u5206\u6790<\/h2>\n<p>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u4e3b\u306a\u6a5f\u80fd\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<ol>\n<li>\n<p><strong>\u4f4f\u6240\u306e\u30bb\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3<\/strong>: \u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001IP \u30a2\u30c9\u30ec\u30b9\u3092\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u90e8\u5206\u3068\u30db\u30b9\u30c8\u90e8\u5206\u306b\u8ad6\u7406\u7684\u306b\u5206\u5272\u3067\u304d\u308b\u305f\u3081\u3001\u52b9\u7387\u7684\u306a\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3068\u30a2\u30c9\u30ec\u30b9\u6307\u5b9a\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u30b5\u30d6\u30cd\u30c3\u30c8\u5316<\/strong>: \u30b5\u30d6\u30cd\u30c3\u30c8\u5316\u306f\u3001\u3088\u308a\u62e1\u5f35\u3055\u308c\u305f\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3092\u4f7f\u7528\u3057\u3066\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u3055\u3089\u306b\u5c0f\u3055\u306a\u30b5\u30d6\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u5206\u5272\u3059\u308b\u30d7\u30ed\u30bb\u30b9\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af \u30ea\u30bd\u30fc\u30b9\u304c\u6700\u9069\u5316\u3055\u308c\u3001\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8 \u30c9\u30e1\u30a4\u30f3\u304c\u524a\u6e1b\u3055\u308c\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u30af\u30e9\u30b9\u30ec\u30b9\u30c9\u30e1\u30a4\u30f3\u9593\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0 (CIDR)<\/strong>CIDR \u306f\u3001\u53ef\u5909\u9577\u30b5\u30d6\u30cd\u30c3\u30c8 \u30de\u30b9\u30af\u3092\u4f7f\u7528\u3057\u3066 IP \u30a2\u30c9\u30ec\u30b9\u3092\u5272\u308a\u5f53\u3066\u308b\u3088\u308a\u67d4\u8edf\u306a\u65b9\u6cd5\u3092\u5c0e\u5165\u3057\u3001\u5229\u7528\u53ef\u80fd\u306a IPv4 \u30a2\u30c9\u30ec\u30b9\u7a7a\u9593\u3092\u3088\u308a\u52b9\u7387\u7684\u306b\u4f7f\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30a2\u30c9\u30ec\u30b9<\/strong>: \u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u3001\u7d44\u7e54\u5185\u306e\u5185\u90e8\u4f7f\u7528\u306e\u305f\u3081\u306b\u4e88\u7d04\u3055\u308c\u3066\u3044\u308b 10.0.0.0\/8\u3001172.16.0.0\/12\u3001192.168.0.0\/16 \u306a\u3069\u306e\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8 IP \u30a2\u30c9\u30ec\u30b9\u7bc4\u56f2\u3092\u5b9a\u7fa9\u3059\u308b\u4e0a\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<\/ol>\n<h2>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u7a2e\u985e<\/h2>\n<p>\u30b5\u30d6\u30cd\u30c3\u30c8 \u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u306e\u9577\u3055\u306b\u57fa\u3065\u3044\u3066\u3001\u3044\u304f\u3064\u304b\u306e\u4e00\u822c\u7684\u306a\u30bf\u30a4\u30d7\u306e\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u304c\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>\u30cd\u30c3\u30c8\u30de\u30b9\u30af<\/th>\n<th>\u30b5\u30d6\u30cd\u30c3\u30c8\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u9577<\/th>\n<th>\u5229\u7528\u53ef\u80fd\u306a\u30db\u30b9\u30c8\u30a2\u30c9\u30ec\u30b9<\/th>\n<th>\u8aac\u660e<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>255.0.0.0<\/td>\n<td>\/8<\/td>\n<td>16,777,214<\/td>\n<td>\u30af\u30e9\u30b9 A \u30cd\u30c3\u30c8\u30de\u30b9\u30af<\/td>\n<\/tr>\n<tr>\n<td>255.255.0.0<\/td>\n<td>\/16<\/td>\n<td>65,534<\/td>\n<td>\u30af\u30e9\u30b9 B \u30cd\u30c3\u30c8\u30de\u30b9\u30af<\/td>\n<\/tr>\n<tr>\n<td>255.255.255.0<\/td>\n<td>\/24<\/td>\n<td>254<\/td>\n<td>\u30af\u30e9\u30b9 C \u30cd\u30c3\u30c8\u30de\u30b9\u30af<\/td>\n<\/tr>\n<tr>\n<td>255.255.255.128<\/td>\n<td>\/25<\/td>\n<td>126<\/td>\n<td>128 IP \u30a2\u30c9\u30ec\u30b9\u306e\u30b5\u30d6\u30cd\u30c3\u30c8 \u30de\u30b9\u30af<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u4f7f\u3044\u65b9\u3001\u4f7f\u7528\u4e0a\u306e\u554f\u984c\u3068\u305d\u306e\u89e3\u6c7a\u7b56<\/h2>\n<h3>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u4f7f\u7528\u65b9\u6cd5:<\/h3>\n<ol>\n<li>\n<p><strong>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a2d\u5b9a<\/strong>: \u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af \u30c7\u30d0\u30a4\u30b9\u3001\u30eb\u30fc\u30bf\u30fc\u3001\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3092\u69cb\u6210\u3059\u308b\u305f\u3081\u306e\u57fa\u672c\u7684\u306a\u8981\u7d20\u3067\u3059\u3002\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306b\u3088\u308a\u3001\u30c7\u30fc\u30bf \u30d1\u30b1\u30c3\u30c8\u304c\u30c7\u30d0\u30a4\u30b9\u3068\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u9593\u3067\u9069\u5207\u306b\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3055\u308c\u308b\u3053\u3068\u304c\u4fdd\u8a3c\u3055\u308c\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u30b5\u30d6\u30cd\u30c3\u30c8\u5316<\/strong>: \u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u3001\u5927\u898f\u6a21\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u5c0f\u3055\u306a\u30b5\u30d6\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u5206\u5272\u3057\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u52b9\u7387\u3068\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u5411\u4e0a\u3055\u305b\u308b\u305f\u3081\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>IP\u30a2\u30c9\u30ec\u30b9\u306e\u5272\u308a\u5f53\u3066<\/strong>: \u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u30c7\u30d0\u30a4\u30b9\u306b IP \u30a2\u30c9\u30ec\u30b9\u3092\u5272\u308a\u5f53\u3066\u3001\u7af6\u5408\u3092\u9632\u304e\u3001\u30a2\u30c9\u30ec\u30b9\u7a7a\u9593\u306e\u4f7f\u7528\u7387\u3092\u6700\u9069\u5316\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<\/li>\n<\/ol>\n<h3>\u554f\u984c\u3068\u89e3\u6c7a\u7b56:<\/h3>\n<ol>\n<li>\n<p><strong>\u30b5\u30d6\u30cd\u30c3\u30c8\u306e\u8aa4\u308a<\/strong>: \u30b5\u30d6\u30cd\u30c3\u30c8\u5316\u304c\u4e0d\u9069\u5207\u3060\u3068\u3001IP \u30a2\u30c9\u30ec\u30b9\u306e\u5272\u308a\u5f53\u3066\u304c\u975e\u52b9\u7387\u306b\u306a\u308a\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u8907\u96d1\u3055\u304c\u5897\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7ba1\u7406\u8005\u306f\u3001\u30b5\u30d6\u30cd\u30c3\u30c8\u5316\u30b9\u30ad\u30fc\u30e0\u3092\u614e\u91cd\u306b\u8a08\u753b\u304a\u3088\u3073\u8a2d\u8a08\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>IP \u30a2\u30c9\u30ec\u30b9\u67af\u6e07<\/strong>IPv4 \u30a2\u30c9\u30ec\u30b9\u306e\u67af\u6e07\u306b\u4f34\u3044\u3001\u5e83\u5927\u306a\u30a2\u30c9\u30ec\u30b9\u7a7a\u9593\u3092\u63d0\u4f9b\u3057\u30b5\u30d6\u30cd\u30c3\u30c8\u5316\u306e\u5fc5\u8981\u6027\u3092\u6392\u9664\u3059\u308b IPv6 \u306e\u5c0e\u5165\u306e\u5fc5\u8981\u6027\u304c\u9ad8\u307e\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u30b5\u30d6\u30cd\u30c3\u30c8\u306e\u7af6\u5408<\/strong>: \u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u8a2d\u5b9a\u304c\u9593\u9055\u3063\u3066\u3044\u308b\u3068\u3001IP \u30a2\u30c9\u30ec\u30b9\u306e\u7af6\u5408\u304c\u767a\u751f\u3057\u3001\u63a5\u7d9a\u306e\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7ba1\u7406\u8005\u306f\u3001\u7af6\u5408\u3092\u56de\u907f\u3059\u308b\u305f\u3081\u306b IP \u30a2\u30c9\u30ec\u30b9\u7ba1\u7406\u30c4\u30fc\u30eb\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<\/li>\n<\/ol>\n<h2>\u4e3b\u306a\u7279\u5fb4\u3068\u985e\u4f3c\u7528\u8a9e\u3068\u306e\u6bd4\u8f03<\/h2>\n<h3>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3068\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4<\/h3>\n<p>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3068\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u3067\u7570\u306a\u308b\u76ee\u7684\u3092\u679c\u305f\u3057\u307e\u3059\u3002\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u3001IP \u30a2\u30c9\u30ec\u30b9\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u90e8\u5206\u3068\u30db\u30b9\u30c8\u90e8\u5206\u306e\u5883\u754c\u3092\u5b9a\u7fa9\u3057\u3001\u540c\u3058\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u306e\u30c7\u30d0\u30a4\u30b9\u304c\u76f4\u63a5\u901a\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002\u4e00\u65b9\u3001\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4 (\u591a\u304f\u306e\u5834\u5408\u3001\u30eb\u30fc\u30bf\u30fc) \u306f\u3001\u7570\u306a\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u9593\u3067\u30c7\u30fc\u30bf \u30d1\u30b1\u30c3\u30c8\u3092\u8ee2\u9001\u3057\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u9593\u901a\u4fe1\u3092\u53ef\u80fd\u306b\u3059\u308b\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002<\/p>\n<h3>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3068CIDR<\/h3>\n<p>CIDR (Classless Inter-Domain Routing) \u306f\u3001\u53ef\u5909\u9577\u30b5\u30d6\u30cd\u30c3\u30c8 \u30de\u30b9\u30af\u3092\u8868\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u8868\u8a18\u6cd5\u3067\u3059\u3002\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u7279\u5b9a\u306e\u30d3\u30c3\u30c8\u6570\u3092 1 \u306b\u8a2d\u5b9a\u3057\u305f\u56fa\u5b9a\u9577\u30b5\u30d6\u30cd\u30c3\u30c8 \u30de\u30b9\u30af\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u304c\u3001CIDR \u3067\u306f\u30b5\u30d6\u30cd\u30c3\u30c8 \u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u306e\u30d3\u30c3\u30c8\u6570\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u3088\u308a\u67d4\u8edf\u306a\u8868\u73fe\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u30cd\u30c3\u30c8\u30de\u30b9\u30af 255.255.255.0 \u306f\u3001CIDR \u8868\u8a18\u3067\u306f \/24 \u3068\u8868\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306b\u95a2\u3059\u308b\u5c06\u6765\u306e\u5c55\u671b\u3068\u6280\u8853<\/h2>\n<p>\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u304c\u6210\u9577\u3092\u7d9a\u3051\u308b\u306b\u3064\u308c\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7ba1\u7406\u8005\u3068\u30a8\u30f3\u30b8\u30cb\u30a2\u306f\u3001IP \u30a2\u30c9\u30ec\u30b9\u306e\u9700\u8981\u306e\u5897\u52a0\u306b\u9069\u5fdc\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u5e83\u5927\u306a\u30a2\u30c9\u30ec\u30b9\u7a7a\u9593\u3092\u6301\u3064 IPv6 \u306e\u63a1\u7528\u306b\u3088\u308a\u3001\u30b5\u30d6\u30cd\u30c3\u30c8\u3068\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3078\u306e\u4f9d\u5b58\u304c\u8efd\u6e1b\u3055\u308c\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306e\u30b7\u30fc\u30e0\u30ec\u30b9\u306a\u62e1\u5f35\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u81ea\u52d5\u5316\u3068\u4eba\u5de5\u77e5\u80fd\u306e\u9032\u6b69\u306b\u3088\u308a\u3001\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u69cb\u6210\u3068\u7ba1\u7406\u304c\u5408\u7406\u5316\u3055\u308c\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7ba1\u7406\u304c\u3088\u308a\u52b9\u7387\u7684\u304b\u3064\u30a8\u30e9\u30fc\u306e\u306a\u3044\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u30d7\u30ed\u30ad\u30b7\u30b5\u30fc\u30d0\u30fc\u306e\u4f7f\u7528\u65b9\u6cd5\u3084\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3068\u306e\u95a2\u9023\u4ed8\u3051\u65b9\u6cd5<\/h2>\n<p>\u30d7\u30ed\u30ad\u30b7 \u30b5\u30fc\u30d0\u30fc\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3068\u533f\u540d\u6027\u306b\u304a\u3044\u3066\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002\u30d7\u30ed\u30ad\u30b7 \u30b5\u30fc\u30d0\u30fc\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3068\u30bf\u30fc\u30b2\u30c3\u30c8 \u30b5\u30fc\u30d0\u30fc\u9593\u306e\u4ef2\u4ecb\u5f79\u3068\u3057\u3066\u52d5\u4f5c\u3059\u308b\u3053\u3068\u3067\u3001\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3092\u5229\u7528\u3057\u3066 IP \u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u304a\u3088\u3073\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8 \u30dd\u30ea\u30b7\u30fc\u3092\u5b9f\u88c5\u3057\u3001IP \u30a2\u30c9\u30ec\u30b9\u7bc4\u56f2\u306b\u57fa\u3065\u3044\u3066\u30a2\u30af\u30bb\u30b9\u3092\u5236\u9650\u307e\u305f\u306f\u8a31\u53ef\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>OneProxy \u306a\u3069\u306e\u30d7\u30ed\u30ad\u30b7 \u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306f\u3001\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3092\u4f7f\u7528\u3057\u3066\u30d7\u30ed\u30ad\u30b7 \u30b5\u30fc\u30d0\u30fc \u30a4\u30f3\u30d5\u30e9\u30b9\u30c8\u30e9\u30af\u30c1\u30e3\u3092\u52b9\u7387\u7684\u306b\u7ba1\u7406\u3067\u304d\u307e\u3059\u3002\u30d7\u30ed\u30ad\u30b7 IP \u30a2\u30c9\u30ec\u30b9\u3092\u7570\u306a\u308b\u30b5\u30d6\u30cd\u30c3\u30c8\u306b\u7de8\u6210\u3059\u308b\u3053\u3068\u3067\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u6700\u9069\u5316\u3057\u3001\u9ad8\u3044\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u78ba\u4fdd\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u95a2\u9023\u30ea\u30f3\u30af<\/h2>\n<p>\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3068\u95a2\u9023\u3059\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u6982\u5ff5\u306e\u8a73\u7d30\u306b\u3064\u3044\u3066\u306f\u3001\u6b21\u306e\u30ea\u30bd\u30fc\u30b9\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<ol>\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\">\u30b5\u30d6\u30cd\u30c3\u30c8\u5316\u306e\u6982\u8981<\/a><\/li>\n<li><a href=\"https:\/\/www.cloudflare.com\/learning\/network-layer\/what-is-cidr\/\" target=\"_new\" rel=\"noopener nofollow\">CIDR \u3092\u7406\u89e3\u3059\u308b<\/a><\/li>\n<li><a href=\"https:\/\/www.arin.net\/resources\/what-is-ipv6\/\" target=\"_new\" rel=\"noopener nofollow\">IPv6: \u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306e\u672a\u6765<\/a><\/li>\n<li><a href=\"https:\/\/www.cloudflare.com\/learning\/cdn\/glossary\/proxy-server\/\" target=\"_new\" rel=\"noopener nofollow\">\u30d7\u30ed\u30ad\u30b7\u30b5\u30fc\u30d0\u30fc\u3068\u305d\u306e\u4f7f\u7528\u4f8b<\/a><\/li>\n<\/ol>\n<p>\u7d50\u8ad6\u3068\u3057\u3066\u3001\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf 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\u30a4\u30f3\u30d5\u30e9\u30b9\u30c8\u30e9\u30af\u30c1\u30e3\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u5f15\u304d\u7d9a\u304d\u91cd\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/p>","protected":false},"featured_media":478114,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-478113","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Netmask: Unraveling the Subnetting Enigma<\/mark>","faq_items":[{"question":"<strong>What is a netmask, and why is it important for networking?<\/strong>","answer":"<p>A netmask, also known as a subnet mask, is a fundamental concept in networking that helps divide IP addresses into two parts: the network portion and the host portion. It plays a crucial role in efficient data routing between devices and networks, ensuring seamless communication.<\/p>"},{"question":"<strong>How did the concept of netmasks originate?<\/strong>","answer":"<p>The concept of netmasks traces back to the early days of computer networking when the Internet Engineering Task Force (IETF) introduced the Internet Protocol version 4 (IPv4) in 1981. This protocol defined the concept of subnet masks to allocate IP addresses more efficiently and facilitate the growth of the internet.<\/p>"},{"question":"<strong>How does a netmask work internally?<\/strong>","answer":"<p>A netmask is a 32-bit value represented by four octets (e.g., 255.255.255.0). Each bit in the netmask corresponds to a bit in the IP address, with 1 indicating the network part and 0 indicating the host part. By performing a bitwise AND operation with an IP address, the netmask extracts the network prefix, enabling devices to determine if they are part of the same network.<\/p>"},{"question":"<strong>What are the key features of netmasks?<\/strong>","answer":"<p>The key features of netmasks include:<\/p><ol><li>Address Segmentation: Dividing IP addresses into network and host parts for efficient routing.<\/li><li>Subnetting: Creating smaller subnetworks for better resource utilization and security.<\/li><li>Classless Inter-Domain Routing (CIDR): Using variable-length subnet masks for flexible IP allocation.<\/li><li>Private Addressing: Defining IP ranges reserved for internal use within organizations.<\/li><\/ol>"},{"question":"<strong>What types of netmasks are there?<\/strong>","answer":"<p>Netmasks come in various types based on the subnet prefix length. Some common examples include:<\/p><ul><li>255.0.0.0 (\/8) - Class A Netmask<\/li><li>255.255.0.0 (\/16) - Class B Netmask<\/li><li>255.255.255.0 (\/24) - Class C Netmask<\/li><li>255.255.255.128 (\/25) - Subnet Mask for 128 IP addresses<\/li><\/ul>"},{"question":"<strong>How are netmasks used in networking?<\/strong>","answer":"<p>Netmasks are essential for configuring network devices, routers, and firewalls. They enable subnetting, which optimizes IP address allocation and reduces broadcast domains. Additionally, netmasks facilitate IP address management and prevent conflicts.<\/p>"},{"question":"<strong>What are common problems related to netmask use, and how can they be resolved?<\/strong>","answer":"<p>Common issues include incorrect subnetting leading to inefficient address allocation and IP conflicts. Network administrators must plan subnetting schemes carefully and use IP address management tools to avoid conflicts.<\/p>"},{"question":"<strong>How does the future of netmasks look like in the ever-evolving networking landscape?<\/strong>","answer":"<p>As the internet grows, the adoption of IPv6 with its vast address space will reduce the reliance on subnetting and netmasks. Advancements in network automation and AI will streamline configuration, making network administration more efficient.<\/p>"},{"question":"<strong>How are proxy servers associated with netmasks?<\/strong>","answer":"<p>Proxy servers use netmasks to implement IP whitelisting and blacklisting, controlling access based on IP ranges. Proxy providers like OneProxy may use netmasks to organize their proxy IP addresses efficiently for optimal performance.<\/p>"},{"question":"<strong>Where can I find more information about netmasks and related networking concepts?<\/strong>","answer":"<p>For further insights, you can explore the following resources:<\/p><ol><li><a href=\"https:\/\/www.cisco.com\/c\/en\/us\/support\/docs\/ip\/routing-information-protocol-rip\/13788-3.html\" target=\"_new\">Introduction to Subnetting<\/a><\/li><li><a href=\"https:\/\/www.cloudflare.com\/learning\/network-layer\/what-is-cidr\/\" target=\"_new\">Understanding CIDR<\/a><\/li><li><a href=\"https:\/\/www.arin.net\/resources\/what-is-ipv6\/\" target=\"_new\">IPv6: The Future of the Internet<\/a><\/li><li><a href=\"https:\/\/www.cloudflare.com\/learning\/cdn\/glossary\/proxy-server\/\" target=\"_new\">Proxy Servers and Their Use Cases<\/a><\/li><\/ol>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/jp\/wp-json\/wp\/v2\/wiki\/478113","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\/478113\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/jp\/wp-json\/wp\/v2\/media\/478114"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/jp\/wp-json\/wp\/v2\/media?parent=478113"}],"curies":[{"name":"\u3046\u30fc\u3093","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}