{"id":195,"date":"2026-01-13T14:46:37","date_gmt":"2026-01-13T05:46:37","guid":{"rendered":"https:\/\/venu-sys.co.jp\/knowledge\/?post_type=glossary&#038;p=195"},"modified":"2026-02-05T20:39:50","modified_gmt":"2026-02-05T11:39:50","slug":"subnet-mask","status":"publish","type":"glossary","link":"https:\/\/venu-sys.co.jp\/knowledge\/glossary\/subnet-mask\/","title":{"rendered":"\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">\u3010\u56f3\u89e3\u3011\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3068\u306f\uff1f\u4ed5\u7d44\u307f\u30fb\u8a08\u7b97\u65b9\u6cd5\u30fbCIDR\u3068\u306e\u5bfe\u5fdc\u3092\u30a8\u30f3\u30b8\u30cb\u30a2\u304c\u89e3\u8aac<\/h1>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"blue\"><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3063\u3066\u3069\u306e\u3088\u3046\u306a\u4ed5\u7d44\u307f\uff1f<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"blue\"><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p>\u300c\/24\u300d\u3084\u300c255.255.255.0\u300d\u3068\u3044\u3063\u305f\u6570\u5b57\u306e\u610f\u5473\u304c\u96e3\u3057\u304f\u3066\u7406\u89e3\u3067\u304d\u306a\u3044<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"blue\"><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u8a08\u7b97\u65b9\u6cd5\u304c\u77e5\u308a\u305f\u3044<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<p>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u69cb\u7bc9\u3084\u8a2d\u5b9a\u306b\u304a\u3044\u3066\u3001\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u7406\u89e3\u306f\u5fc5\u9808\u3068\u3082\u3044\u3048\u307e\u3059\u3002\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3068\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u533a\u5207\u308a\u3092\u6c7a\u3081\u308b\u305f\u3081\u306e\u8b58\u5225\u756a\u53f7\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306b\u306f\u3001\u4e0d\u8981\u306a\u901a\u4fe1\u3092\u524a\u6e1b\u3057\u305f\u308a\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u5411\u4e0a\u3055\u305b\u305f\u308a\u3068\u91cd\u8981\u306a\u5f79\u5272\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u5f79\u5272\u304b\u3089\u8a08\u7b97\u65b9\u6cd5\u3001\u73fe\u5834\u3067\u5f79\u7acb\u3064\u5bfe\u5fdc\u65e9\u898b\u8868\u307e\u3067\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_announce\">\u8a18\u4e8b\u3092\u8aad\u3081\u3070\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u533a\u5207\u308a\u65b9\u3092\u7406\u89e3\u3057\u3001\u73fe\u5834\u3067\u3082\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3092\u3046\u307e\u304f\u6d3b\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3068\u306f\u300c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u533a\u5207\u308a\u300d\u3092\u6c7a\u3081\u308b\u305f\u3081\u306e\u8b58\u5225\u756a\u53f7<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" width=\"1024\" height=\"572\" src=\"https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-51-1024x572.jpg\" alt=\"\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3068\u306f\u306e\u753b\u50cf\" class=\"wp-image-199\" style=\"width:640px\" srcset=\"https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-51-1024x572.jpg 1024w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-51-300x167.jpg 300w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-51-768x429.jpg 768w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-51-1536x857.jpg 1536w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-51-2048x1143.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u3001IP\u30a2\u30c9\u30ec\u30b9\u3092\u300c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u90e8\u300d\u3068\u300c\u30db\u30b9\u30c8\u90e8\u300d\u306e2\u3064\u306b\u5206\u3051\u308b\u305f\u3081\u306e\u6570\u5024\u3067\u3059\u3002<strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color has-swl-deep-01-color\">IP\u30a2\u30c9\u30ec\u30b9\u3068\u3044\u3046\u5e83\u5927\u306a\u4f4f\u6240\u9332\u306e\u4e2d\u3067\u3001\u3069\u306e\u7bc4\u56f2\u304c\u540c\u3058\u30b0\u30eb\u30fc\u30d7\uff08\u753a\u5185\u4f1a\uff09\u306b\u5c5e\u3059\u308b\u304b\u3092\u5b9a\u7fa9<\/span><\/span><\/strong>\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>IP\u30a2\u30c9\u30ec\u30b9\u3060\u3051\u3067\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u7bc4\u56f2\u304c\u3069\u3053\u307e\u3067\u306a\u306e\u304b\u3092\u5224\u5225\u3067\u304d\u307e\u305b\u3093\u3002\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3092\u91cd\u306d\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u521d\u3081\u3066\u7279\u5b9a\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u5883\u754c\u7dda\u304c\u660e\u78ba\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_pen\">\u4f8b\uff1a\u30aa\u30d5\u30a3\u30b9\u30d3\u30eb\u3092\u60f3\u50cf\u3057\u3066\u304f\u3060\u3055\u3044\u3002<br><br>IP\u30a2\u30c9\u30ec\u30b9\u304c\u300c\u30d3\u30eb\u5168\u4f53\u306e\u4f4f\u6240\u300d\u3060\u3068\u3057\u305f\u3089\u3001\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u300c\u968e\u6570\u3084\u90e8\u5c4b\u756a\u53f7\u3067\u5206\u3051\u308b\u4ed5\u5207\u308a\u300d\u306e\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002<br>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u8a2d\u5b9a\u304c1\u3064\u3067\u3082\u305a\u308c\u308b\u3068\u3001\u96a3\u306e\u90e8\u5c4b\u306b\u30c7\u30fc\u30bf\u304c\u5c4a\u304b\u306a\u3044\u3001\u3042\u308b\u3044\u306f\u7121\u95a2\u4fc2\u306a\u90e8\u5c4b\u306b\u30c7\u30fc\u30bf\u304c\u6d41\u308c\u308b\u3068\u3044\u3063\u305f\u901a\u4fe1\u30c8\u30e9\u30d6\u30eb\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u6a5f\u5668\u306f\u3001\u81ea\u5206\u3068\u540c\u3058\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u306b\u5b9b\u5148\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u305f\u3081\u306b\u3001\u5fc5\u305a\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3092\u53c2\u7167\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u305f\u3081\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u3001\u5186\u6ed1\u306a\u901a\u4fe1\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306b\u6b20\u304b\u305b\u306a\u3044\u5b58\u5728\u3068\u3044\u3048\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6458210138304151\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- \u6a2a\u9577 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:728px;height:150px\"\r\n     data-ad-client=\"ca-pub-6458210138304151\"\r\n     data-ad-slot=\"3619347934\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n\n\n\n<h2 class=\"wp-block-heading\">CIDR\u8a18\u6cd5\u3092\u7406\u89e3\u3057\u3088\u3046<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" width=\"1024\" height=\"572\" src=\"https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-52-1024x572.jpg\" alt=\"CIDR\u8868\u8a18\u306e\u8aac\u660e\" class=\"wp-image-200\" style=\"width:640px\" srcset=\"https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-52-1024x572.jpg 1024w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-52-300x167.jpg 300w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-52-768x429.jpg 768w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-52-1536x857.jpg 1536w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-52-2048x1143.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>CIDR\uff08\u30b5\u30a4\u30c0\u30fc\uff09\u8a18\u6cd5\u306f\u3001\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3092\u7c21\u6f54\u306b\u8868\u8a18\u3059\u308b\u305f\u3081\u306e\u65b9\u6cd5\u3067\u3059\u3002\u3053\u3053\u304b\u3089\u306f\u3001\u300c\/24\u300d\u306e\u610f\u5473\u3084\u73fe\u5834\u3067\u3088\u304f\u4f7f\u308f\u308c\u308b\u30d1\u30bf\u30fc\u30f3\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\/24 | \u5de6\u304b\u308924\u30d3\u30c3\u30c8\uff08255.255.255.0\uff09\u307e\u3067\u304c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u90e8\u3068\u3044\u3046\u610f\u5473<\/h3>\n\n\n\n<p>\u300c\/24\u300d\u3068\u3044\u3046\u8868\u8a18\u306f\u3001<strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color has-swl-deep-01-color\">IP\u30a2\u30c9\u30ec\u30b9\u306e32\u30d3\u30c3\u30c8\u306e\u3046\u3061\u3001\u5de6\u304b\u308924\u30d3\u30c3\u30c8\u76ee\u307e\u3067\u3092\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u8b58\u5225\u3068\u3057\u3066\u4f7f\u3046\u3053\u3068<\/span><\/span><\/strong>\u3092\u793a\u3057\u307e\u3059\u3002IP\u30a2\u30c9\u30ec\u30b9\u30922\u9032\u6570\u3067\u8868\u8a18\u3057\u305f\u969b\u30011\u304c\u4e26\u3093\u3067\u3044\u308b\u90e8\u5206\u306e\u6570\u3092\u30b9\u30e9\u30c3\u30b7\u30e5\u306e\u5f8c\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_pen\">\u4f8b\uff1a255.255.255.0\u30922\u9032\u6570\u306b\u5909\u63db\u3059\u308b\u3068\u30018\u30d3\u30c3\u30c8\u305a\u3064\u306e\u584a\u304c<br>\u300c11111111.11111111.11111111.00000000\u300d\u3068\u306a\u308a\u307e\u3059\u3002<br><br>1\u306e\u6570\u3092\u5408\u8a08\u3059\u308b\u306824\u500b\u306b\u306a\u308b\u305f\u3081\u3001\/24\u3068\u8868\u8a18\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>CIDR\u8868\u8a18\u3092\u898b\u308c\u3070\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7ba1\u7406\u8005\u306f\u4e00\u76ee\u3067\u300c\u7b2c3\u30aa\u30af\u30c6\u30c3\u30c8\u307e\u3067\u304c\u56fa\u5b9a\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u756a\u53f7\u3067\u3042\u308b\u300d\u3068\u5224\u65ad\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u73fe\u5834\u3067\u3088\u304f\u4f7f\u308f\u308c\u308b\u30d1\u30bf\u30fc\u30f3<\/h3>\n\n\n\n<p>\u5b9f\u52d9\u3067\u306f\u3001\u5229\u7528\u3059\u308b\u7aef\u672b\u6570\u306b\u5fdc\u3058\u3066\u4f7f\u308f\u308c\u308b\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u304c\u6c7a\u307e\u3063\u3066\u3044\u307e\u3059\u3002\u7279\u306b\u5bb6\u5ead\u5185LAN\u3084\u5c0f\u898f\u6a21\u30aa\u30d5\u30a3\u30b9\u3067\u306f\u300c\/24\u300d\u304c\u5727\u5012\u7684\u306b\u591a\u3044\u3067\u3059\u304c\u3001\u7279\u5b9a\u306e\u7528\u9014\u3067\u306f\u5225\u306e\u30d1\u30bf\u30fc\u30f3\u3082\u983b\u51fa\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table style=\"font-size:12px;\" class=\"has-fixed-layout\"><thead><tr><td><strong>CIDR<\/strong><\/td><td><strong>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af<\/strong><\/td><td><strong>\u5229\u7528\u53ef\u80fd\u306a\u30db\u30b9\u30c8\u6570<\/strong><\/td><td><strong>\u4e3b\u306a\u5229\u7528\u30b7\u30fc\u30f3<\/strong><\/td><\/tr><\/thead><tbody><tr><td>\/24<\/td><td>255.255.255.0<\/td><td>254\u53f0<\/td><td>\u4e00\u822c\u7684\u306aLAN\u3001Wi-Fi\u74b0\u5883<\/td><\/tr><tr><td>\/28<\/td><td>255.255.255.240<\/td><td>14\u53f0<\/td><td>\u5c11\u4eba\u6570\u306e\u90e8\u7f72\u3001\u691c\u8a3c\u74b0\u5883<\/td><\/tr><tr><td>\/30<\/td><td>255.255.255.252<\/td><td>2\u53f0<\/td><td>\u30eb\u30fc\u30bf\u30fc\u540c\u58eb\u306e\u63a5\u7d9a\uff08\u5bfe\u5411\u63a5\u7d9a\uff09<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color has-swl-deep-01-color\">\u30db\u30b9\u30c8\u6570\u304c\u300c254\u53f0\u300d\u3084\u300c2\u53f0\u300d\u3068\u306a\u3063\u3066\u3044\u308b\u7406\u7531\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u81ea\u4f53\u3092\u8868\u3059\u30a2\u30c9\u30ec\u30b9\u3068\u3001\u5168\u54e1\u306b\u9001\u308b\u305f\u3081\u306e\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30a2\u30c9\u30ec\u30b9\u306e2\u3064\u3092\u9664\u5916\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u305f\u3081<\/span><\/span><\/strong>\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_announce\">\u8a2d\u8a08\u6642\u306b\u306f\u30de\u30a4\u30ca\u30b92\u306e\u30eb\u30fc\u30eb\u3092\u5fd8\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6458210138304151\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- \u6a2a\u9577 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:728px;height:150px\"\r\n     data-ad-client=\"ca-pub-6458210138304151\"\r\n     data-ad-slot=\"3619347934\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n\n\n\n<h2 class=\"wp-block-heading\">\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u304c\u5fc5\u8981\u306a\u7406\u7531<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" width=\"1024\" height=\"572\" src=\"https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-53-1024x572.jpg\" alt=\"\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u304c\u5fc5\u8981\u306a\u7406\u7531\u306e\u753b\u50cf\" class=\"wp-image-201\" style=\"width:640px\" srcset=\"https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-53-1024x572.jpg 1024w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-53-300x167.jpg 300w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-53-768x429.jpg 768w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-53-1536x857.jpg 1536w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-53-2048x1143.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u304c\u5fc5\u8981\u3068\u3055\u308c\u308b\u7406\u7531\u306f\u3001\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box is-style-onborder_ttl2\"><div class=\"cap_box_ttl\" data-has-icon=\"1\"><svg height=\"1em\" width=\"1em\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-hidden=\"true\" viewBox=\"0 0 48 48\"><path d=\"M32 46.5H16c-1.1 0-2-.9-2-2s.9-2 2-2h16c1.1 0 2 .9 2 2s-.9 2-2 2zM33.3 18.6c-.7 0-1.3-.5-1.5-1.2-.7-3.2-3.2-5.7-6.4-6.3-.8-.1-1.4-.9-1.2-1.7s.9-1.4 1.7-1.2c4.4.8 8 4.2 8.9 8.6.2.8-.4 1.6-1.2 1.8h-.3z\"><\/path><path d=\"M30 40.5H18c-2.2 0-4-1.8-4-4v-1.6c0-.6-.3-1.1-.8-1.5C8.4 29.8 5.7 24 6 18c.5-9.1 8-16.6 17.1-17C29 .8 34.5 3.2 38.2 8c1.8 2.3 3 5.1 3.5 7.9 1.1 6.8-1.5 13.3-6.9 17.4-.6.4-.9 1-.9 1.7v1.5c.1 2.2-1.7 4-3.9 4zM23.3 5c-7.1.3-12.9 6.2-13.3 13.2-.2 4.7 1.8 9.1 5.6 11.9 1.5 1.1 2.4 2.9 2.4 4.7v.6c0 .6.4 1 1 1h10c.6 0 1-.4 1-1V35c0-1.9.9-3.7 2.5-4.8 4.3-3.2 6.3-8.5 5.3-13.9-.4-2-1.2-3.8-2.4-5.4-3-4-7.4-6.1-12.1-5.9z\"><\/path><\/svg><span>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u304c\u5fc5\u8981\u306a\u7406\u7531<\/span><\/div><div class=\"cap_box_content\">\n<ul class=\"wp-block-list is-style-check_list\">\n<li><a href=\"#toc1\">\u4e0d\u8981\u306a\u901a\u4fe1\uff08\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\uff09\u3092\u524a\u6e1b\u3067\u304d\u308b<\/a><\/li>\n\n\n\n<li><a href=\"#toc2\">\u90e8\u7f72\u3054\u3068\u306b\u901a\u4fe1\u7bc4\u56f2\u3092\u9650\u5b9a\u3057\u3001\u5916\u90e8\u3084\u4ed6\u90e8\u7f72\u304b\u3089\u306e\u4e0d\u6b63\u30a2\u30af\u30bb\u30b9\u3092\u9632\u6b62\u3059\u308b<\/a><\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"toc1\">\u4e0d\u8981\u306a\u901a\u4fe1\uff08\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\uff09\u3092\u524a\u6e1b\u3067\u304d\u308b<\/h3>\n\n\n\n<p>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u3067\u306f\u3001\u5168\u7aef\u672b\u306b\u5411\u3051\u3066\u4e00\u6589\u306b\u30c7\u30fc\u30bf\u3092\u9001\u308b\u300c\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u300d\u3068\u547c\u3070\u308c\u308b\u901a\u4fe1\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u7bc4\u56f2\u304c\u5e83\u3059\u304e\u308b\u3068\u3001\u95a2\u4fc2\u306e\u306a\u3044\u7aef\u672b\u307e\u3067\u3053\u306e\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u3063\u3066\u51e6\u7406\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u305a\u3001\u901a\u4fe1\u5e2f\u57df\u304c\u5727\u8feb\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color has-swl-deep-01-color\">\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3067\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u9069\u5207\u306a\u30b5\u30a4\u30ba\u306b\u533a\u5207\u308c\u3070\u3001\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u306e\u5f71\u97ff\u7bc4\u56f2\u3092\u9650\u5b9a\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd<\/span><\/span><\/strong>\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_pen\">\u9053\u8def\u3067\u4f8b\u3048\u308b\u306a\u3089\u3001\u4e00\u672c\u306e\u5de8\u5927\u306a\u5e79\u7dda\u9053\u8def\u306b\u5168\u3066\u306e\u8eca\u3092\u8d70\u3089\u305b\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u751f\u6d3b\u9053\u8def\u3092\u9069\u5207\u306b\u5206\u3051\u308b\u3053\u3068\u3067\u6e0b\u6ede\u3092\u9632\u3050\u3088\u3046\u306a\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"toc2\">\u90e8\u7f72\u3054\u3068\u306b\u901a\u4fe1\u7bc4\u56f2\u3092\u9650\u5b9a\u3057\u3001\u5916\u90e8\u3084\u4ed6\u90e8\u7f72\u304b\u3089\u306e\u4e0d\u6b63\u30a2\u30af\u30bb\u30b9\u3092\u9632\u6b62\u3059\u308b<\/h3>\n\n\n\n<p>\u30b5\u30d6\u30cd\u30c3\u30c8\u3092\u5206\u3051\u308b\u3053\u3068\u3067\u3001<strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color has-swl-deep-01-color\">\u7269\u7406\u7684\u306b\u540c\u3058\u62e0\u70b9\u306b\u3044\u3066\u3082\u8ad6\u7406\u7684\u306a\u58c1\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059<\/span><\/span><\/strong>\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u300c\u7dcf\u52d9\u90e8\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u300d\u3068\u300c\u6765\u5ba2\u7528Wi-Fi\u300d\u3092\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3067\u5206\u3051\u308c\u3070\u3001\u6765\u5ba2\u304c\u7dcf\u52d9\u90e8\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30fc\u30d0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u3092\u9632\u3050\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u30eb\u30fc\u30bf\u30fc\u3084\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u7279\u5b9a\u306e\u30b5\u30d6\u30cd\u30c3\u30c8\u9593\u306e\u307f\u901a\u4fe1\u3092\u8a31\u53ef\u3059\u308b\u8a2d\u5b9a\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6458210138304151\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- \u6a2a\u9577 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:728px;height:150px\"\r\n     data-ad-client=\"ca-pub-6458210138304151\"\r\n     data-ad-slot=\"3619347934\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"hayami\">\u3010\u30b3\u30d4\u30fc\u53ef\u3011\u8a2d\u5b9a\u30df\u30b9\u3092\u9632\u3050\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u30fbCIDR\u30fb\u30db\u30b9\u30c8\u6570\u65e9\u898b\u8868<\/h2>\n\n\n\n<p>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a2d\u5b9a\u6642\u306b\u8ff7\u308f\u306a\u3044\u305f\u3081\u306e\u65e9\u898b\u8868\u3067\u3059\u3002\u5b9f\u52d9\u3067\u5165\u529b\u3092\u6c42\u3081\u3089\u308c\u305f\u969b\u3001\u8a08\u7b97\u306e\u624b\u9593\u3092\u7701\u304f\u305f\u3081\u306b\u6d3b\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table style=\"font-size:12px;\" class=\"has-fixed-layout\"><thead><tr><td><strong>CIDR<\/strong><\/td><td><strong>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af<\/strong><\/td><td><strong>\u30db\u30b9\u30c8\u6570\uff08\u5229\u7528\u53ef\u80fdIP\u6570\uff09<\/strong><\/td><\/tr><\/thead><tbody><tr><td>\/32<\/td><td>255.255.255.255<\/td><td>1\uff08\u7279\u5b9a\u306e1\u53f0\u306e\u307f\uff09<\/td><\/tr><tr><td>\/30<\/td><td>255.255.255.252<\/td><td>2<\/td><\/tr><tr><td>\/29<\/td><td>255.255.255.248<\/td><td>6<\/td><\/tr><tr><td>\/28<\/td><td>255.255.255.240<\/td><td>14<\/td><\/tr><tr><td>\/27<\/td><td>255.255.255.224<\/td><td>30<\/td><\/tr><tr><td>\/26<\/td><td>255.255.255.192<\/td><td>62<\/td><\/tr><tr><td>\/25<\/td><td>255.255.255.128<\/td><td>126<\/td><\/tr><tr><td>\/24<\/td><td>255.255.255.0<\/td><td>254<\/td><\/tr><tr><td>\/23<\/td><td>255.255.254.0<\/td><td>510<\/td><\/tr><tr><td>\/22<\/td><td>255.255.252.0<\/td><td>1,022<\/td><\/tr><tr><td>\/16<\/td><td>255.255.0.0<\/td><td>65,534<\/td><\/tr><tr><td>\/8<\/td><td>255.0.0.0<\/td><td>16,777,214<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6458210138304151\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- \u6a2a\u9577 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:728px;height:150px\"\r\n     data-ad-client=\"ca-pub-6458210138304151\"\r\n     data-ad-slot=\"3619347934\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n\n\n\n<h2 class=\"wp-block-heading\">\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u8a08\u7b97\u624b\u9806<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" width=\"1024\" height=\"572\" src=\"https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-54-1024x572.jpg\" alt=\"\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u8a08\u7b97\u624b\u9806\" class=\"wp-image-215\" style=\"width:640px\" srcset=\"https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-54-1024x572.jpg 1024w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-54-300x167.jpg 300w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-54-768x429.jpg 768w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-54-1536x857.jpg 1536w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-54-2048x1143.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color 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async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6458210138304151\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- \u6a2a\u9577 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:728px;height:150px\"\r\n     data-ad-client=\"ca-pub-6458210138304151\"\r\n     data-ad-slot=\"3619347934\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n\n\n\n<h2 class=\"wp-block-heading\">\u3010\u73fe\u5834\u306e\u30ea\u30a2\u30eb\u3011\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u3069\u306e\u3088\u3046\u306a\u5834\u9762\u3067\u4f7f\u3046\uff1f<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" width=\"1024\" height=\"572\" src=\"https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-55-1024x572.jpg\" alt=\"\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u3069\u306e\u3088\u3046\u306a\u753b\u9762\u3067\u4f7f\u7528\u3059\u308b\u304b\u306e\u753b\u50cf\" class=\"wp-image-216\" style=\"width:640px\" srcset=\"https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-55-1024x572.jpg 1024w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-55-300x167.jpg 300w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-55-768x429.jpg 768w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-55-1536x857.jpg 1536w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/01\/unnamed-55-2048x1143.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u5b9f\u969b\u306e\u73fe\u5834\u3067\u306f\u3001<strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color 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window.adsbygoogle || []).push({});\r\n<\/script>\n\n\n\n<h2 class=\"wp-block-heading\">\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306b\u95a2\u3059\u308b\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n\n\n\n<div class=\"swell-block-faq\" data-q=\"fill-main\" data-a=\"col-text\">\n<div class=\"swell-block-faq__item\"><h3 class=\"faq_q\">\u300c255.255.255.0\u300d\u4ee5\u5916\u306e\u6570\u5b57\u304c\u51fa\u3066\u304d\u305f\u3089\u3069\u3046\u3059\u308c\u3070\u3044\u3044\uff1f<\/h3><div class=\"faq_a\">\n<p><strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color has-swl-deep-01-color\">\u300c255.255.255.192\u300d\u3084\u300c255.255.255.240\u300d\u3068\u3044\u3063\u305f\u6570\u5b57\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u3055\u3089\u306b\u7d30\u304b\u304f\u5206\u5272\u3057\u3066\u3044\u308b\u30b5\u30a4\u30f3\u3067\u3001\u30b5\u30d6\u30cd\u30c3\u30c6\u30a3\u30f3\u30b0<\/span><\/span><\/strong>\u3068\u547c\u3070\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p><a 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