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IP Class is a designation for the IP address based on the number of bits in its address. This number ranges from 0 to 127. The IP Classes are A, B, C, D, E and F.

A Class A IP address is one in which the first octet bit is set to zero, resulting in numbers ranging from 1 to 127. A Class B address, on the other hand, uses the remaining address set by setting the first bit to one and the second bit to zero.

Medium and large-scale networks in businesses and organisations use Class B IP addresses. They can support up to 65,000 hosts across 16,000 networks.

In small company and household networks, Class C addresses are the most popular. On each of the 2 million networks, these can accommodate up to 256 hosts.

Multicast groups are uniquely identified using Class D addresses, which are 32-bit network addresses with values ranging from to

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