What are the IP address classes?

The IP address classes are the classification or grouping of IP addresses. Each IP address class has a network part and a host part. The network part decides how much network possible with a type of IP address class and the host part decides how many hosts each network can have.

Initially, the purpose was to allocate the correct IP address to enable the use of a correct number of hosts. For example, if an organization has a few numbers of hosts, then the class IP address class with a lesser number of hosts will be suitable.  For a larger number of hosts, a class with more hosts will be suitable.

There can be a total of five types of IP address classes. The class of an IP address can be identified from the first byte. Following describing IP address classes for each type.

IP address classes description 

First Octet Class  Subnet Mask Description
0 to 127       A 8 bits The first 8 bits represent the
Network Part for Class A IP address.
128 to 191       B 16 bits The first 24 bits represent the
Network Part for Class B IP address.
192 to 223       C 24 bits The first 24 bits represent the
Network Part for Class C IP address.
224 to 239       D NA Class D is multicasting
240 to 255        E NA Reserved


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