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BLOCK | SUBNET | # OF IPs
/13 255.248.0.0 512k
/14 255.252.0.0 256k
/15 255.254.0.0 128k
/16 255.255.0.0 64k
/17 255.255.128.0 32k
/18 255.255.192.0 16k
/19 255.255.224.0 8k
/20 255.255.240.0 4k
/21 255.255.248.0 2k
/22 255.255.252.0 1k
/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
/31 255.255.255.254 2
/32 255.255.255.255 1
first 2 IPs in a block, and very last IP are unusable when assigned in a standard vlan
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