Address classes
| Class |
Network mask |
Network addresses |
Supports |
| A |
255.0.0.0 |
1.0.0.1 to 126.255.255.254 |
Supports 16 million hosts on each of 127 networks. |
| B |
255.255.0.0 |
128.1.0.1 to 191.255.255.254 |
Supports 65,000 hosts on each of 16,000 networks. |
| C |
255.255.255.0 |
192.0.1.1 to 223.255.254.254 |
Supports 254 hosts on each of 2 million networks. |
| D |
not defined |
224.0.0.0 to 239.255.255.255 |
Reserved for multicast groups. |
| E |
not defined |
240.0.0.0 to 254.255.255.2545 |
Reserved for future use, or research and development purposes. |
Private IP address
These private IP ranges are as follows:
| Network addresses |
| 10.0.0.0 - 10.255.255.255 |
| 172.16.0.0 - 172.31.255.255 |
| 192.168.0.0 - 192.168.255.255 |
IP Subnet
| Prefix size |
Network mask |
| /1 |
128.0.0.0 |
| /2 |
192.0.0.0 |
| /3 |
224.0.0.0 |
| /4 |
240.0.0.0 |
| /5 |
248.0.0.0 |
| /6 |
252.0.0.0 |
| /7 |
254.0.0.0 |