Back شبكة صنفية Arabic Třídy IP adres Czech Netzklasse German Classe d'adresse IP French Classi di indirizzi IP Italian 네트워크 클래스 Korean Rangkaian berkelas Malay Nettverksklasse NB Классовая адресация Russian Класна мрежа Serbian
A 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. 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.
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.