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IP Address Classes
There are five classes of IP addresses which are:
The first bit of a class An address is always set to 0. It only leaves seven bits for the network portion of the address. Class A addresses range from 0.0.0.0 – 127.0.0.0. It means there can only be 128 network numbers.
The first bit of a class B address is always set to 1 and the second bit is set to 0. It means 16,384 networks can be assigned class B addresses. The numbers range from 22.214.171.124 – 126.96.36.199.
Class C addresses have their first two bits set to 1, and the third bit is set to 0. It means 2,097,152 networks can be assigned this class of address. The numbers range from 192.0.0.0 – 188.8.131.52.
Class D addresses have their first three bits set to 1, and the fourth bit is set to 0. Class D addresses are used for multicasting applications. The numbers range from 184.108.40.206 – 220.127.116.11 and are reserved for multicast groups.
Class E addresses are reserved for experimentation and testing and have never been utilized in any standard form.