IPv4 Subnet Size Reference Table

Subnet / mask / total-addresses per subnet

/20 -- 255.255.240.0 -- 4096
/21 -- 255.255.248.0 -- 2048
/22 -- 255.255.252.0 -- 1024
/23 -- 255.255.254.0 -- 512
/24 -- 255.255.255.0 -- 256
/25 -- 255.255.255.128 -- 128
/26 -- 255.255.255.192 -- 64
/27 -- 255.255.255.224 -- 32
/28 -- 255.255.255.240 -- 16
/29 -- 255.255.255.248 -- 8
/30 -- 255.255.255.252 -- 4


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