How many valid hosts/subnets in a range
| 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 <- hosts |
| 128 | 192 | 224 | 240 | 248 | 252 | 254 | 255 <- mask |
| 2 | 4 | 8 | 16 | 32 | 64 | 128 | 256 -> subnets |
| /25 | /26 | /27 | /28 | /29 | /30 | /31 | /32 <- short |
| 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 <- hosts |
| 128 | 192 | 224 | 240 | 248 | 252 | 254 | 255 <- mask |
| 2 | 4 | 8 | 16 | 32 | 64 | 128 | 256 -> subnets |
| /25 | /26 | /27 | /28 | /29 | /30 | /31 | /32 <- short |