| Class | Start | End | Mask | CIDR | CIDR Mask | CIDR Wildcard |
| A | 10.0.0.0 | 10.255.255.255 | 255.0.0.0 | 10.0.0.0/8 | 255.0.0.0 | 0.255.255.255 |
| B | 172.16.0.0 | 172.31.255.255 | 255.240.0.0 | 172.16.0.0/12 | 255.240.0.0 | 0.15.255.255 |
| C | 192.168.0.0 | 192.168.255.0 | 255.255.255.0 | 192.168.0.0/16 | 255.255.0.0 | 0.0.255.255 |
| Some other special address ranges | ||||||
| Windows autoconfiguration (for when the DHCP server is down) | ||||||
| B | 169.254.0.0 | 169.254.255.255 | 255.255.0.0 | 169.254.0.0/16 | 255.255.0.0 | 0.0.255.255 |