http://www.rfc-editor.org/rfc/rfc1883.txt
RFC 1883: Internet Protocol, Version 6 (IPv6) Specification, S. Deering, R. Hinden1995-12-01T23:00:00-00:00This document specifies version 6 of the Internet Protocol (IPv6), also sometimes referred to as IP Next Generation or IPng. [STANDARDS-TRACK]