
VERSION NUMBERS

(last updated 2007-04-03)

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
-------   -------    -------                            ----------
  0-1                Reserved                    [JBP][RFC-ietf-mpls-ecmp-bcp-03.txt]
  2-3                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.

[RFC-ietf-mpls-ecmp-bcp-03.txt]
           G. Swallow, S. Bryant, L. Andersson, "Avoiding Equal Cost 
           Multipath Treatment in MPLS Networks", RFC XXXX, Month Year.


PEOPLE
------

[JBP] Jon Postel <postel&isi.edu>

[JWF] Jim Forgie <FORGIE&XN.LL.MIT.ED>

[RH6] Robert Hinden <Hinden&ENG.SUN.COM>

[Deering] Steve Deering, <deering&parc.xerox.com>, March 1995.

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