Internet Assigned Numbers Authority
  • Domains
  • Protocols
  • Numbers
  • About

                                                                  IP Version Numbers

Last Updated
        2021-01-28

Note

 In the Internet Protocol (IP) [RFC 791]; [RFC 8200] there is a field to identify
 the version of the internetwork general protocol.  This field is 4
 bits in size.


Available Formats
        [IMG]
        XML [IMG]
        HTML [IMG]
        TXT

Registry Included Below

  • IP Version Numbers

IP Version Numbers

Registration Procedure(s)

             Standards Action


Reference
        [RFC 2780]

Available Formats
        [IMG]
        CSV

Decimal Keyword           Version                                  Reference
  0-1           Reserved                    [Jon_Postel]; [RFC 4928]
  2-3           Unassigned                  [Jon_Postel]
   4    IP      Internet Protocol           [RFC 791]; [Jon_Postel]
   5            Reserved (Historic)         [RFC 1819]; [Moving IP versions 5, 8, and 9 to Historic]
   6    IPv6    Internet Protocol version 6 [RFC 8200]
   7            Reserved (Historic)         [RFC 1475]; [RFC 6814]
   8            Reserved (Historic)         [RFC 1621]; [Moving IP versions 5, 8, and 9 to Historic]
   9            Reserved (Historic)         [RFC 1347]; [Moving IP versions 5, 8, and 9 to Historic]
 10-14          Unassigned                  [Jon_Postel]
  15            Reserved                    [Jon_Postel]

                                                                 Contact Information

     ID         Name         Contact URI      Last Updated
[Jon_Postel] Jon Postel mailto:postel&isi.edu

Licensing Terms