子网掩码-掩码位-反掩码对比表
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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
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 = 128.0.0.0 63.255.255.255 = 2 = 192.0.0.0 31.255.255.255 = 3 = 224.0.0.0 15.255.255.255 = 4 = 240.0.0.0 7.255.255.255 = 5 = 248.0.0.0 3.255.255.255 = 6 = 252.0.0.0 1.255.255.255 = 7 = 254.0.0.0 0.255.255.255 = 8 = 255.0.0.0 0.127.255.255 = 9 = 255.128.0.0 0.63.255.255 = 10 = 255.192.0.0 0.31.255.255 = 11 = 255.224.0.0 0.15.255.255 = 12 = 255.240.0.0 0.7.255.255 = 13 = 255.248.0.0
0.3.255.255 = 14 = 255.252.0.0
0.1.255.255 = 15 = 255.254.0.0
0.0.255.255 = 16 = 255.255.0.0
0.0.127.255 = 17 = 255.255.128.0
0.0.63.255 = 18 = 255.255.192.0
0.0.31.255 = 19 = 255.255.224.0
0.0.15.255 = 20 = 255.255.240.0
0.0.7.255 = 21 = 255.255.248.0 0.0.3.255 = 22 = 255.255.252.0 0.0.1.255 = 23 = 255.255.254.0 0.0.0.255 = 24 = 255.255.255.0 0.0.0.127 = 25 = 255.255.255.128 0.0.0.63 = 26 = 255.255.255.192
0.0.0.31 = 27 = 255.255.255.224 0.0.0.15 = 28 = 255.255.255.240 0.0.0.7 = 29 = 255.255.255.248 0.0.0.3 = 30 = 255.255.255.252 0.0.0.1 = 31 = 255.255.255.254 0.0.0.0 = 32 = 255.255.255.255