As a consequence of this architecture, the address space supported only a low number (254) of independent networks.īefore the introduction of address classes, the only address blocks available were these large blocks which later became known as Class A networks. ![]() This format was sufficient at a time when only a few large networks existed, such as the ARPANET (network number 10), and before the wide proliferation of local area networks (LANs). The remaining 24 bits specified the local address, also called rest field (the rest of the address), which uniquely identified a host connected to that network. In the original address definition, the most significant eight bits of the 32-bit IPv4 address was the network number field which specified the particular network a host was attached to. Since its discontinuation, remnants of classful network concepts have remained in practice only in limited scope in the default configuration parameters of some network software and hardware components, most notably in the default configuration of subnet masks. Class D is for multicast networking and the class E address range is reserved for future or experimental purposes. Classes A, B, and C provide unicast addresses for networks of three different network sizes. The method divides the IP address space for Internet Protocol version 4 (IPv4) into five address classes based on the leading four address bits. ![]() ![]() Early system for organizing the IPv4 address space Map of the prototype Internet in 1982, showing 8-bit-numbered networks (ovals) only, interconnected by routers (rectangles).Ī classful network is an obsolete network addressing architecture used in the Internet from 1981 until the introduction of Classless Inter-Domain Routing (CIDR) in 1993.
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