{"width":"100%","height":"190","url":"https://iww.hateblo.jp/entry/20180523/p1","published":"2018-05-23 00:00:00","author_name":"iww","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fiww.hateblo.jp%2Fentry%2F20180523%2Fp1\" title=\" \u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e /8 \u3068\u304b /16 \u3068\u304b\u306e\u8868\u8a18\u3092 255.0.0.0 \u3068\u304b 255.255.0.0 \u3068\u304b\u306b\u5909\u63db\u3059\u308bbash\u30b9\u30af\u30ea\u30d7\u30c8 - \u63ee\u767a\u6027\u306e\u30e1\u30e2\uff12\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","provider_name":"Hatena Blog","blog_title":"\u63ee\u767a\u6027\u306e\u30e1\u30e2\uff12","categories":["bash","Linux"],"provider_url":"https://hatena.blog","image_url":"https://ws-fe.amazon-adsystem.com/widgets/q?_encoding=UTF8&ASIN=B004P77RB4&Format=_SL160_&ID=AsinImage&MarketPlace=JP&ServiceVersion=20070822&WS=1&tag=iwwmemo-22","author_url":"https://blog.hatena.ne.jp/iww/","blog_url":"https://iww.hateblo.jp/","title":" \u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e /8 \u3068\u304b /16 \u3068\u304b\u306e\u8868\u8a18\u3092 255.0.0.0 \u3068\u304b 255.255.0.0 \u3068\u304b\u306b\u5909\u63db\u3059\u308bbash\u30b9\u30af\u30ea\u30d7\u30c8","description":"\u3042\u306e 192.168.0.1/8 \u307f\u305f\u3044\u306a\u304a\u3057\u3083\u308c\u306a\u66f8\u304d\u65b9\u3092 Classless Inter-Domain Routing\uff08CIDR\uff1a\u30b5\u30a4\u30c0\u30fc\uff09 \u3068\u547c\u3076\u3089\u3057\u3044\u3002 IP\u30a2\u30c9\u30ec\u30b9\u3068\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3092\u307e\u3068\u3081\u3066\u8868\u8a18\u3059\u308b\uff1aTech TIPS - \uff20IT #!/bin/bash A=$1 C=$(( 2**(32-$A)-1 )) D=$(( 0xFFFFFFFF^$C )) E1=$(( $D>>24 )) E2=$(( ($D>>16) & 0xFF )) E3=$(( ($D>>8) & 0xFF )) E4=$(( $D & 0xFF )) echo $E1.$E2.$E3.$E4 $ ./mas\u2026","type":"rich","version":"1.0"}