What Is Network Classes?
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Network classes are sets of IP addresses that have been divided into five categories based on the first octet of a network address. The five network classes include Class A, Class B, Class C, Class D and Class E. Each class of IP address uses a different format for the first octet and assigns different ranges to it. Class A is used for very large networks and typically contains more than 16 million hosts, while Class B and Class C are used for smaller sized networks and can accommodate up to 65,535 and 254 hosts respectively. Class D and E are not commonly used.