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1、子网掩码-掩码位-反掩码对比表子网掩码 CIDR主机数 可用主机数 C类网段数量SubnetMaskCIDRPrefixTotalIP'sUsableIP'sNumberofClassCnetworks255.255.255.255/32111/256th255.255.255.254/31201/128th255.255.255.252/30421/64th255.255.255.248/29861/32nd255.255.255.240/2816141/16th255.255.255.224/273
2、2301/8th255.255.255.192/2664621/4th255.255.255.128/251281261half255.255.255.0/242562541255.255.254.0/235125102255.255.252.0/22102410224255.255.248.0/21204820468255.255.240.0/204096409416255.255.224.0/198192819032255.255.192.0/1816,38416,38264255.255.128.0/1732,76
3、832,766128255.255.0.0/1665,53665,534256255.254.0.0/15131,072131,070512255.252.0.0/14262,144262,1421024255.248.0.0/13524,288524,2862048255.240.0.0/121,048,5761,048,5744096255.224.0.0/112,097,1522,097,1508192255.192.0.0/104,194,3044,194,30216,384255.128.0.0/98,388,
4、6088,388,60632,768255.0.0.0/816,777,21616,777,21465,536254.0.0.0/733,554,43233,554,430131,072252.0.0.0/667,108,86467,108,862262,144248.0.0.0/5134,217,728134,217,7261,048,576240.0.0.0/4268,435,456268,435,4542,097,152224.0.0.0/3536,870,912536,870,9104,194,304192.0.
5、0.0/21,073,741,8241,073,741,8228,388,608128.0.0.0/12,147,483,6482,147,483,64616,777,2160.0.0.0/04,294,967,2964,294,967,29433,554,432子网掩码-掩码位-反掩码对照表反掩码： 掩码位： 正掩码：127.255.255.255 = 1 = 128.0.0.063.255.255.255 = 2 = 192.0.0.031.255.255.2
6、55 = 3 = 224.0.0.015.255.255.255 = 4 = 240.0.0.07.255.255.255 = 5 = 248.0.0.03.255.255.255 = 6 = 252.0.0.01.255.255.255 = 7 = 254.0.0.00.255.255.255 = 8 = 255.0.0.00.127.255.255 = 9 = 255.128.0.0
7、0.63.255.255 = 10= 255.192.0.00.31.255.255 = 11= 255.224.0.00.15.255.255 = 12= 255.240.0.00.7.255.255 = 13= 255.248.0.00.3.255.255 = 14= 255.252.0.00.1.255.255 = 15= 255.254.0.00.0.255.255 = 1
8、6= 255.255.0.00.0.127.255 = 17= 255.255.128.00.0.63.255 = 18= 255.255.192.00.0.31.255 = 19= 255.255.224.00.0.15.255
