VERSION NUMBERS (last updated 2 July 2004) In the Internet Protocol (IP) [RFC791] there is a field to identify the version of the internetwork general protocol. This field is 4 bits in size. Assigned Internet Version Numbers Decimal Keyword Version References ------- ------- ------- ---------- 0 Reserved [JBP] 1-3 Unassigned [JBP] 4 IP Internet Protocol [RFC791,JBP] 5 ST ST Datagram Mode [RFC1190,JWF] 6 IPv6 Internet Protocol version 6 [RFC1752] 7 TP/IX TP/IX: The Next Internet [RFC1475] 8 PIP The P Internet Protocol [RFC1621] 9 TUBA TUBA [RFC1347] 10-14 Unassigned [JBP] 15 Reserved [JBP] REFERENCES ---------- [RFC791] Postel, J., ed., "Internet Protocol - DARPA Internet Program Protocol Specification", STD 5, RFC 791, USC/Information Sciences Institute, September 1981. [RFC1190] Topolcic, C., Editor, "Experimental Internet Stream Protocol, Version 2 (ST-II)", RFC 1190, CIP Working Group, October 1990. [RFC1347] R. Callon, "TCP and UDP with Bigger Addresses (TUBA), A Simple Proposal for Internet Addressing and Routing", RFC 1347, June 1992. [RFC1475] R. Ullmann, "TP/IX: The Next Internet", RFC 1475, June 1993. [RFC1621] P. Francis, "Pip Near-term Architecture", RFC 1621, May 1994. [RFC1752] Bradner, S., and A. Mankin, "The Recommendation for the IP Next Generation Protocol", RFC 1752, Harvard University, ISI, January 1995. PEOPLE ------ [JPB] Jon Postel [JWF] Jim Forgie [RH6] Robert Hinden [Deering] Steve Deering, , March 1995. []