IPv4 Address Classes
In the early days of the Internet, the IANA (Internet Assigned Numbers Authority) defined five classes of public IP addresses as shown below.
|Class||Theoretical Address Range||Binary Start||Used for|
|A||0.0.0.0 to 127.255.255.255||0||Very large networks|
|B||126.96.36.199 to 188.8.131.52||10||Medium networks|
|C||192.0.0.0 to 184.108.40.206||110||Small networks|
|D||220.127.116.11 to 18.104.22.168||1110||Multicast|
|E||240.0.0.0 to 247.255.255.255||1111||Experimental|
In practice some of these addresses are reserved for private addresses.
Use the links below to find out more about the three main address classes.
Next: Private IP Addresses