                                                                   Version Numbers

   Last Updated
           2007-06-27

   Note

 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.

   This registry is also available in XML and plain text formats.

   Registry included below

     * IP Version Numbers

IP Version Numbers

   Registration Procedures
           IETF Standards Action

   Reference
           [RFC2780]

   Decimal Keyword           Version                 Reference
     0-1           Reserved                    [Jon_Postel][RFC4928]
     2-3           Unassigned                  [Jon_Postel]
      4    IP      Internet Protocol           [RFC791][Jon_Postel]
      5    ST      ST Datagram Mode            [RFC1190][Jim_Forgie]
      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                  [Jon_Postel]
     15            Reserved                    [Jon_Postel]

                                                                        People

        ID         Name           Contact URI         Last Updated
   [Jim_Forgie] Jim Forgie mailto:FORGIE&xn.ll.mit.ed
   [Jon_Postel] Jon Postel mailto:postel&isi.edu
