Prefix Subnet Host Usable
/32 255.255.255.255 1 1
/31 255.255.255.254 2 0
/30 255.255.255.252 4 2
/29 255.255.255.248 8 6
/28 255.255.255.240 16 14
/27 255.255.255.224 32 30
/26 255.255.255.192 64 62
/25 255.255.255.128 128 126
/24 255.255.255.10 256 254
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Class B Space is denoted in number of Class C's
Ripe Subnet # of Class C's
/23 255.255.254.0 2
/22 255.255.252.0 4
/21 255.255.248.0 8
/20 255.255.240.0 16
/19 255.255.224.0 32
/18 255.255.192.0 64
/17 255.255.128.0 128
/16 255.255.0.0 256
