http://www.rfc-editor.org/rfc/rfc2374.txt
RFC 2374: An IPv6 Aggregatable Global Unicast Address Format, R. Hinden, M. O'Dell, S. Deering1998-07-01T23:00:00-00:00This document defines an IPv6 aggregatable global unicast address format for use in the Internet. [STANDARDS-TRACK]