RFC 1010 (rfc1010) - Page 3 of 44


Assigned numbers



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RFC 1010 - Assigned Numbers                                     May 1987
Version Numbers


                            VERSION NUMBERS

   In the Internet Protocol (IP) [36,80] 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                    [80,JBP]
          5       ST       ST Datagram Mode                     [41,JWF]
       6-14                Unassigned                              [JBP]
         15                Reserved                                [JBP]


































Reynolds & Postel