Internet Assigned Numbers Authority

                                                                  X.25 Type Numbers

   Last Updated
           2007-08-30

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     * X.25 Type Numbers

X.25 Type Numbers

   Registration Procedure(s)

 Not assigned by IANA

   Reference
           [N/A]

   Note

 ITU-T TSB defines the high order two bits of the first octet of call user
 data as follows:

 00 - Used for other ITU-T TSB recommendations (such as X.29)
 01 - Reserved for use by "national" administrative
      authorities
 10 - Reserved for use by international administrative authorities
 11 - Reserved for arbitrary use between consenting DTEs

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   Call User Data (hex)          Protocol                                                 Reference
   01                   PAD                         [Alain_Lanssiers]
   C5                   Blacker front-end descr dev [Alain_Lanssiers]
   CC                   IP                          [RFC877][Alain_Lanssiers][ISO SC6/WG2 approved assignment in ISO 9577 (January 1990).]
   CD                   ISO-IP                      [Alain_Lanssiers]
   CF                   PPP                         [RFC1598]
   DD                   Network Monitoring          [Alain_Lanssiers]

                                                                 Contact Information

          ID              Name              Contact URI        Last Updated
   [Alain_Lanssiers] Alain Lanssiers mailto:alanssie&cisco.com

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