Classes of IP Address

There are five classes of available IP ranges: Class A, Class B, Class C, Class D and Class E, while only A, B and C are commonly used. Each class allows for a range of valid IP addresses


Class A      1.0.0.1      to   126.255.255.254            Supports 16 million hosts on each of 127 networks.

Class B      128.1.0.1  to   191.255.255.254             Supports 65,000 hosts on each of 16,000 networks.

Class C      192.0.1.1  to   223.255.254.254             Supports 254 hosts on each of 2 million networks.

Class D      224.0.0.0  to   239.255.255.255             Reserved for multicast groups.

Class E      240.0.0.0  to   254.255.255.254             Reserved