| notation | resulting subnet | ||||
| netmask | shorthand | number of addresses | |||
| 255.255.255.0 | /24 [8-bit] | 28 = | 256 | = 254 hosts + 1 bcast + 1 net base | |
| 255.255.255.128 | /25 [7-bit] | 27 = | 128 | = 126 hosts + 1 bcast + 1 net base | |
| 255.255.255.192 | /26 [6-bit] | 26 = | 64 | = 62 hosts + 1 bcast + 1 net base | |
| 255.255.255.224 | /27 [5-bit] | 25 = | 32 | = 30 hosts + 1 bcast + 1 net base | |
| 255.255.255.240 | /28 [4-bit] | 24 = | 16 | = 14 hosts + 1 bcast + 1 net base | |
| 255.255.255.248 | /29 [3-bit] | 23 = | 8 | = 6 hosts + 1 bcast + 1 net base | |
| 255.255.255.252 | /30 [2-bit] | 22 = | 4 | = 2 hosts + 1 bcast + 1 net base | |
| 255.255.255.254 | /31 [1-bit] | 21 = | – | invalid (no possible hosts) | |
| 255.255.255.255 | /32 [0-bit] | 20 = | 1 | a host route (odd duck case) | |
