A classful network is a network addressing architecture used in the Internet from 1981 until the introduction of Classless Inter-Domain Routing in 1993. The method divides the IP address space for Internet Protocol version 4 (IPv4) into five address classes based on the leading four address bits. Classes A, B, and C provide unicast addresses for networks of three different network sizes. Class D is for multicast networking, and the class E address range is reserved for future or experimental purposes.
A Class B network was a network in which all addresses had the two most-significant bits set to 1 and 0, respectively. For these networks, the network address was given by the next 14 bits of the address, thus leaving 16 bits for the numbering host on the network for a total of 65536 addresses per network.
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