This is very useful for IP address planning and management especially for network engineers as part of designing their network. This is one of the consideration in proper assignment of IPs to the network devices and hosts.
IPv4 Address Classes
| Classes | IP Address Range |
| A | 0.0.0.0 – 127.255.255.255 |
| B | 128.0.0.0 – 191.255.255.255 |
| C | 192.0.0.0 – 223.255.255.255 |
| D | 224.0.0.0 – 239.255.255.255 |
| E | 240.0.0.0 – 255.255.255.255 |
Reserved (Private) IPv4
| Classes | IP Address Range |
| A | 10.0.0.0 – 10.255.255.255 |
| B | 172.16.0.0 – 172.31.255.255 |
| C | 192.168.0.0 – 192.168.255.255 |
| Localhost | 127.0.0.0 – 127.255.255.255 |
| APIPA | 169.254.0.0 – 169.254.255.255 |
APIPA or short for Automatic Private Internet Protocol Addressing, is also alternatively referred to Autonet, Zero configuration network and Zeroconf.
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