Classless Inter-Domain Routing

"Classless Routing (CIDR)", Section 4.3.2 in Computer Networks, 4th ed., Peterson & Davie (2007).

RFC-4632, BCP 122 (2006), "Classless Inter-domain Routing (CIDR): The Internet Address Assignment and Aggregation Plan", V.Fuller, T.Li, http://tools.ietf.org/html/rfc4632.