subnet mask / CIDR †
| MASK | | | | | HOST数 |
| /0 | 0.0.0.0 | 256 | 256 | 256 | 256 | 4294967296 |
| /1 | 128.0.0.0 | 128 | 256 | 256 | 256 | 2147483648 |
| /2 | 192.0.0.0 | 64 | 256 | 256 | 256 | 1073741824 |
| /3 | 224.0.0.0 | 32 | 256 | 256 | 256 | 536870912 |
| /4 | 240.0.0.0 | 16 | 256 | 256 | 256 | 268435456 |
| /5 | 248.0.0.0 | 8 | 256 | 256 | 256 | 134217728 |
| /6 | 252.0.0.0 | 4 | 256 | 256 | 256 | 67108864 |
| /7 | 254.0.0.0 | 2 | 256 | 256 | 256 | 33554432 |
| /8 | 255.0.0.0 | 1 | 256 | 256 | 256 | 16777216 |
| /9 | 255.128.0.0 | | 128 | 256 | 256 | 8388608 |
| /10 | 255.192.0.0 | | 64 | 256 | 256 | 4194304 |
| /11 | 255.224.0.0 | | 32 | 256 | 256 | 2097152 |
| /12 | 255.240.0.0 | | 16 | 256 | 256 | 1048576 |
| /13 | 255.248.0.0 | | 8 | 256 | 256 | 524288 |
| /14 | 255.252.0.0 | | 4 | 256 | 256 | 262144 |
| /15 | 255.254.0.0 | | 2 | 256 | 256 | 131072 |
| /16 | 255.255.0.0 | | 1 | 256 | 256 | 65536 |
| /17 | 255.255.128.0 | | | 128 | 256 | 32768 |
| /18 | 255.255.192.0 | | | 64 | 256 | 16384 |
| /19 | 255.255.224.0 | | | 32 | 256 | 8192 |
| /20 | 255.255.240.0 | | | 16 | 256 | 4096 |
| /21 | 255.255.248.0 | | | 8 | 256 | 2048 |
| /22 | 255.255.252.0 | | | 4 | 256 | 1024 |
| /23 | 255.255.254.0 | | | 2 | 256 | 512 |
| /24 | 255.255.255.0 | | | 1 | 256 | 256 |
| /25 | 255.255.255.128 | | | | 128 | 128 |
| /26 | 255.255.255.192 | | | | 64 | 64 |
| /27 | 255.255.255.224 | | | | 32 | 32 |
| /28 | 255.255.255.240 | | | | 16 | 16 |
| /29 | 255.255.255.248 | | | | 8 | 8 |
| /30 | 255.255.255.252 | | | | 4 | 4 |
| /31 | 255.255.255.254 | | | | 2 | 2 |
| /32 | 255.255.255.255 | | | | 1 | 1 |