Subnet Cheat Sheet

This quick reference crib sheet made for day to day subnetting tasks

IPv4 Subnetting Chart

CIDR Subnet # Addresses Wildcard
/32 255.255.255.255 1 0.0.0.0
/31 255.255.255.254 2 0.0.0.1
/30 255.255.255.252 4 0.0.0.3
/29 255.255.255.248 8 0.0.0.7
/28 255.255.255.240 16 0.0.0.15
/27 255.255.255.224 32 0.0.0.31
/26 255.255.255.192 64 0.0.0.63
/25 255.255.255.128 128 0.0.0.127
/24 255.255.255.0 256 0.0.0.255
/23 255.255.254.0 512 0.0.1.255
/22 255.255.252.0 1024 0.0.3.255
/21 255.255.248.0 2048 0.0.7.255
/20 255.255.240.0 4096 0.0.15.255
/19 255.255.224.0 8192 0.0.31.255
/18 255.255.192.0 16,384 0.0.63.255
/17 255.255.128.0 32,768 0.0.127.255
/16 255.255.0.0 65,536 0.0.255.255
/15 255.254.0.0 131,072 0.1.255.255
/14 255.252.0.0 262,144 0.3.255.255
/13 255.248.0.0 524,288 0.7.255.255
/12 255.240.0.0 1,048,576 0.15.255.255
/11 255.224.0.0 2,097,152 0.31.255.255
/10 255.192.0.0 4,194,304 0.63.255.255
/9 255.128.0.0 8,388,608 0.127.255.255
/8 255.0.0.0 16,777,216 0.255.255.255
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