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CIDR Conversions / Networking

CIDR Prefix Length Netmask Hosts (Class C’s/B’s/A’s)
/32255.255.255.255 1
/31 255.255.255.254 2
/30 255.255.255.252 4
/29 255.255.255.248 8
/28 255.255.255.240 16
/27 255.255.255.224 32
/26 255.255.255.192 64
/25 255.255.255.128 128
/24 (Class C) 255.255.255.0 256 / 1
/23 255.255.254.0 512 / 2
/22 255.255.252.0 1,024 / 4
/21 255.255.248.0 2,048 / 8
/20 255.255.240.0 4,096 / 16
/19 255.255.224.0 8,192 / 32
/18 255.255.192.0 16,384 / 64
/17 255.255.128.0 32,768 / 128
/16 (Class B) 255.255.0.0 65,536 / 256 / 1
/15 255.254.0.0 131,072 / 512 / 2
/14 255.252.0.0 262,144 / 1024 / 4
/13 255.248.0.0 524,288 / 2048 / 8
/12 255.240.0.0 1,048,576 / 4096 / 16
/11 255.224.0.0 2,097,152 / 8129 / 32
/10 255.192.0.0 4,194,304 / 16,384 / 64
/9 255.128.0.0 8,388,608 / 32,768 / 128
/8 (Class A) 255.0.0.0 16,777,216 / 65,536 / 256 / 1
/7 254.0.0.0 33,554,432 / 131,072 / 512 / 2
/6 252.0.0.0 67,108,864 / 262,144 / 1,024 / 4
/5 248.0.0.0 134,217,728 / 524,288 / 2,048 / 8
/4 240.0.0.0 268,435,456 / 1,048,576 / 4,096 / 16
/3 224.0.0.0 536,870,912 / 2,097,152 / 8,192 / 32
/2 192.0.0.0 1,073,741,824 / 4,194,304 / 16,384 / 64
/1 128.0.0.0 2,147,483,648 / 8,388,608 / 32,768 / 128
/0 0.0.0.0 4,294,967,296 / 16,777,216 / 65,536 / 256