| Range Start Address | Range End Address | Classful Address Equivalent | Classless Address Equivalent | Description |
|---|---|---|---|---|
| 0.0.0.0 | 0.255.255.255 | Class A network 0.x.x.x | 0/8 | Reserved |
| 10.0.0.0 | 10.255.255.255 | Class A network 10.x.x.x | 10/8 | Class A private address block |
| 127.0.0.0 | 127.255.255.255 | Class A network 127.x.x.x | 127/8 | Loopback address |
| 128.0.0.0 | 128.0.255.255 | Class B network 128.0.x.x | 128.0/16 | Reserved |
| 169.254.0.0 | 169.254.255.255 | Class B network 169.254.x.x | 169.254/16 | Class B private address block reserved for automatic private address allocation |
| 172.16.0.0 | 172.31.255.255 | 16 contiguous Class B networks from 172.16.x.x through 172.31.x.x | 172.16/12 | Class B private address blocks |
| 191.255.0.0 | 191.255.255.255 | Class B network 191.255.x.x | 191.255/16 | Reserved |
| 192.0.0.0 | 192.0.0.255 | Class C network 192.0.0.x | 192.0.0/24 | Reserved |
| 192.168.0.0 | 192.168.0.255 | 256 contiguous Class C networks from 192.168.0.x through 192.168.255.x | 192.168/16 | Class C private address blocks |
| 223.255.255.0 | 223.255.255.255 | Class C network 223.255.255.x | 223.255.255/24 | Reserved |