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