Classful and Classless IP Addressing

Classful addressing scheme

Classful Addressing The first major addressing scheme was published in September 1981 in RFC 790 by IETF. The IP addressing scheme was 32 bits long in size and addressing scheme were three classes A, B, and C, corresponding to 8-bit, 16-bit, and 24-bit prefixes. No other prefix lengths allowed at that time, and there was no […]