CIDR Conversion Table
CIDR Length Mask # Networks # Hosts
/1 128.0.0.0 128 A 2,147,483,392
/2 192.0.0.0 64 A 1,073,741,696
/3 224.0.0.0 32 A 536,870,848
/4 240.0.0.0 16 A 268,435,424
/5 248.0.0.0 8 A 134,217,712
/6 252.0.0.0 4 A 67,108,856
/7 254.0.0.0 2 A 33,554,428
/8 255.0.0.0 1 A 16,777,214
/9 255.128.0.0 128 B 8,388,352
/10 255.192.0.0 64 B 4,194,176
/11 255.224.0.0 32 B 2,097,088
/12 255.240.0.0 16 B 1,048,544
/13 255.248.0.0 8 B 524,272
/14 255.252.0.0 4 B 262,136
/15 255.254.0.0 2 B 131,068
/16 255.255.0.0 1 B 65,024
/17 255.255.128.0 128 C 32,512
/18 255.255.192.0 64 C 16,256
/19 255.255.224.0 32 C 8,128
/20 255.255.240.0 16 C 4,064
/21 255.255.248.0 8 C 2,032
/22 255.255.252.0 4 C 1,016
/23 255.255.254.0 2 C 508
/24 255.255.255.0 1 C 254
/25 255.255.255.128 2 subnets 124
/26 255.255.255.192 4 subnets 62
/27 255.255.255.224 8 subnets 30
/28 255.255.255.240 16 subnets 14
/29 255.255.255.248 32 subnets 6
/30 255.255.255.252 64 subnets 2
/31 255.255.255.254 none none
/32 255.255.255.255 1/256 C 1