Subnet Mask Cheat SheetSee also RFC 1878. Addresses Hosts Netmask Amount of a Class C/30 4 2 255.255.255.252 1/64/29 8 6 255.255.255.248 1/32/28 16 14 255.255.255.240 1/16/27 32 30 255.255.255.224 1/8/26 64 62 255.255.255.192 1/4/25 128 126 255.255.255.128 1/2/24 256 254 255.255.255.0 1/23 512 510 255.255.254.0 2/22 1024 1022 255.255.252.0 4/21 2048 2046 255.255.248.0 8/20 4096 4094 255.255.240.0 16/19 8192 8190 255.255.224.0 32/18 16384 16382 255.255.192.0 64/17 32768 32766 255.255.128.0 128/16 65536 65534 255.255.0.0 256Guide to sub-class C blocks/25 -- 2 Subnets -- 126 Hosts/SubnetNetwork # IP Range Broadcast.0 .1-.126 .127.128 .129-.254 .255 via Subnet Mask Cheat Sheet.