CICR

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CIDR prefix dotted decimal
netmask
hex netmask inverse mask number of

classfull

networks
number of host
addresses *
/1 128.0.0.0 80 00 00 00 127.255.255.255 128 As 2,147,483,646
/2 192.0.0.0 c0 00 00 00 63.255.255.255 64 As 1,073,741,822
/3 224.0.0.0 e0 00 00 00 31.255.255.255 32 As 536,870,910
/4 240.0.0.0 f0 00 00 00 15.255.255.255 16 As 268,435,454
/5 248.0.0.0 f8 00 00 00 7.255.255.255 8 As 134,217,726
/6 252.0.0.0 fc 00 00 00 3.255.255.255 4 As 67,108,862
/7 254.0.0.0 fe 00 00 00 1.255.255.255 2 As 33,554,430
/8 255.0.0.0 ff 00 00 00 0.255.255.255 1 A or 256 Bs 16,777,214
/9 255.128.0.0 ff 80 00 00 0.127.255.255 128 Bs 8,388,606
/10 255.192.0.0 ff c0 00 00 0.63.255.255 64 Bs 4,194,302
/11 255.224.0.0 ff e0 00 00 0.31.255.255 32 Bs 2,097,150
/12 255.240.0.0 ff f0 00 00 0.15.255.255 16 Bs 1,048,574
/13 255.248.0.0 ff f8 00 00 0.7.255.255 8 Bs 524,286
/14 255.252.0.0 ff fc 00 00 0.3.255.255 4 Bs 262,142
/15 255.254.0.0 ff fe 00 00 0.1.255.255 2 Bs 131,070
/16 255.255.0.0 ff ff 00 00 0.0.255.255 1 B or 256 Cs 65,534
/17 255.255.128.0 ff ff 80 00 0.0.127.255 128 Cs 32,766
/18 255.255.192.0 ff ff c0 00 0.0.63.255 64 Cs 16,382
/19 255.255.224.0 ff ff e0 00 0.0.31.255 32 Cs 8,190
/20 255.255.240.0 ff ff f0 00 0.0.15.255 16 Cs 4,094
/21 255.255.248.0 ff ff f8 00 0.0.7.255 8 Cs 2,046
/22 255.255.252.0 ff ff fc 00 0.0.3.255 4 Cs 1,022
/23 255.255.254.0 ff ff fe 00 0.0.1.255 2 Cs 510
/24 255.255.255.0 ff ff ff 00 0.0.0.255 1 C 254
/25 255.255.255.128 ff ff ff 80 0.0.0.127 1/2 C 126
/26 255.255.255.192 ff ff ff c0 0.0.0.63 1/4 C 62
/27 255.255.255.224 ff ff ff e0 0.0.0.31 1/8 C 30
/28 255.255.255.240 ff ff ff f0 0.0.0.15 1/16 C 14
/29 255.255.255.248 ff ff ff f8 0.0.0.7 1/32 C 6
/30 255.255.255.252 ff ff ff fc 0.0.0.3 1/64 C 2
/31 255.255.255.254 ff ff ff fe 0.0.0.1 1/128 C 0
/32 255.255.255.255 ff ff ff ff 0.0.0.0 1/256 C 1