    Network Working Group                                          J. Postel
    Request for Comments: 755                                        USC-ISI
    IEN: 93                                                       3 May 1979

    Obsoletes: 750,
    739, 604, 503, 433, 349

                                ASSIGNED NUMBERS

    This Network Working Group Request for Comments documents the currently
    assigned values from several series of numbers used in network protocol
    implementations.  This RFC will be updated periodically, and in any case
    current information can be obtained from Jon Postel. The assignment of
    numbers is also handled by Jon.  If you are developing a protocol or
    application that will require the use of a link, socket, etc. please
    contact Jon to receive a number assignment.

       Jon Postel
       USC - Information Sciences Institute
       4676 Admiralty Way
       Marina del Rey, California  90291

       phone: (213) 822-1511

       ARPANET mail: POSTEL@ISIB

    Most of the protocols mentioned here are documented in the RFC series of
    notes. The more prominent and more generally used are documented in the
    Protocol Handbook [1] prepared by the Network Information Center (NIC).
    In the lists that follow a bracketed number, e.g. [1], off to the right
    of the page indicates a reference for the listed protocol.

    Postel                                                          [Page 1]

    RFC 755                                                       3 May 1979
    IEN 93                                                  Assigned Numbers
    Link Numbers

                             ASSIGNED LINK NUMBERS

       The word "link" here refers to a field in the original ARPANET
       Host/IMP interface leader.  The link was originally defined as an 8
       bit field.  Some time after the ARPANET Host-to-Host (AHHP) protocol
       was defined and, by now, some time ago the definition of this field
       was changed to "Message-ID" and the length to 12 bits. The name link
       now refers to the high order 8 bits of this 12 bit message-id field.
       The low order 4 bits of the message-id field are to be zero unless
       specifically specified otherwise for the particular protocol used on
       that link.  The Host/IMP interface is defined in BBN report 1822 [2].

       Link Assignments:

          Decimal   Octal     Description                         References
          -------   -----     -----------                         ----------
          0         0         AHHP Control Messages                    [1,3]
          1         1         Reserved
          2-71      2-107     AHHP Regular Messages                    [1,3]
          72-151    110-227   Reserved
          152       230       PARC Universal Protocol
          153       231       TIP Status Reporting
          154       232       TIP Accounting
          155-158   233-236   Internet Protocol             [35,36,42,43,44]
          159-191   237-277   Measurements                              [28]
          192-195   300-303   Message Switching Protocol               [4,5]
          196-255   304-377   Experimental Protocols
          224-255   340-377   NVP                                     [1,39]

    Postel                                                          [Page 2]

    RFC 755                                                       3 May 1979
    IEN 93                                                  Assigned Numbers
    Socket Numbers

                            ASSIGNED SOCKET NUMBERS

       Sockets are used in the AHHP [1,3] to name the ends of logical
       connections which carry long term conversations.  For the purpose of
       providing services to all callers an Initial Connection Procedure ICP
       [1,34] is used between the user process and the server process.  This
       list specifies the socket used by the server process as its contact
       socket.

       Socket Assignments:

          General Assignments:

             Decimal   Octal     Description
             -------   -----     -----------
             0-63      0-77      Network Wide Standard Function
             64-127    100-177   Hosts Specific Functions
             128-223   200-337   Reserved for Future Use
             224-255   340-377   Any Experimental Function

          Specific Assignments:

             Network Standard Functions

             Decimal   Octal     Description                      References
             -------   -----     -----------                      ----------
             1         1         Old Telnet                              [6]
             3         3         Old File Transfer                   [7,8,9]
             5         5         Remote Job Entry                     [1,10]
             7         7         Echo                                   [11]
             9         11        Discard                                [12]
             11        13        Who is on or SYSTAT
             13        15        Date and Time
             15        17        Who is up or NETSTAT
             17        21        Short Text Message
             19        23        Character generator or TTYTST          [13]
             21        25        New File Transfer                 [1,14,15]
             23        27        New Telnet                        [1,16,17]
             25        31        Distributed Programming System      [18,19]
             27        33        NSW User System w/COMPASS FE           [20]
             29        35        MSG-3 ICP                              [21]
             31        37        MSG-3 Authentication                   [21]
             33        41        DPS ICP                             [18,19]
             35        43        IO Station Spooler
             37        45        Time Server                          [1,22]
             39        47        NSW User System w/SRI FE               [20]

    Postel                                                          [Page 3]

    RFC 755                                                       3 May 1979
    IEN 93                                                  Assigned Numbers
    Socket Numbers

             41        51        Graphics                             [1,26]
             42-63     52-77     unassigned

             Host Specific Functions

             Decimal   Octal     Description                      References
             -------   -----     -----------                      ----------
             65        101       Speech Data Base at LL-TX-2            [23]
             67        103       Datacomputer at CCA                    [24]
             69        105       CPYNET
             71        107       NETRJS (EBCDIC) at UCLA-CCN          [1,25]
             73        111       NETRJS (ASCII-68) at UCLA-CCN        [1,25]
             75        113       NETRJS (ASCII-63) at UCLA-CCN        [1,25]
             77        115       any private RJE server
             79        117       Name or Finger                       [1,40]
             81        121       Network BSYS
             83        123       MIT ML Device
             85        125       MIT ML Device
             86-94     126-136   unassigned
             95        137       SUPDUP                                 [33]
             97        141       Datacomputer Status
             98-127    142-136   unassigned

             Reserved for Future Use

             Decimal   Octal     Description                      References
             -------   -----     -----------                      ----------
             128-223   200-337   reserved

             Experimental Functions

             Decimal   Octal     Description                      References
             -------   -----     -----------                      ----------
             224-231   340-347   unassigned
             232-237   350-355   Authorized Mailer at BBN
             239       357       unassigned
             241       361       NCP Measurement                     [27,28]
             243       363       Survey Measurement               [28,29,30]
             245       365       LINK                                   [31]
             247       367       TIPSRV
             249-255   371-377   RSEXEC                              [31,32]

    Postel                                                          [Page 4]

    RFC 755                                                       3 May 1979
    IEN 93                                                  Assigned Numbers
    Network Numbers

                            ASSIGNED NETWORK NUMBERS

       This list of network numbers is used in the internetwork protocols
       now under development, the field is 8 bits in size.

       Assigned Network Numbers

          Decimal   Octal  Name        Network                    References
          -------   -----  ----        -------                    ----------
                0       0              Reserved
                1       1  BBN-PR      BBN Packet Radio Network
                2       2  SF-PR-1     SF Bay Area Packet Radio Network (1)
                3       3  BBN-RCC     BBN RCC Network
                4       4  SATNET      Atlantic Satellite Network
                5       5  SILL-PR     Ft. Sill Packet Radio Network
                6       6  SF-PR-2     SF Bay Area Packet Radio Network (2)
                7       7  CHAOS       CHAOS Network
                8      10  BBN-SAT-TEST  BBN SATNET Test Network
                9      11  BRAGG-PR    Ft. Bragg Packet Radio Network
               10      12  ARPANET     ARPANET                         [1,2]
               11      13  UCLNET      University College London Network
               12      14  CYCLADES    CYCLADES
               13      15  NPLNET      National Physical Laboratory
               14      16  TELENET     TELENET
               15      17  EPSS        British Post Office EPSS
               16      20  DATAPAC     DATAPAC
               17      21  TRANSPAC    TRANSPAC
               18      22  LCSNET      LCS Network                   [37,38]
               19      23  TYMNET      TYMNET
               20      24  DC-PR       Washington D.C. Packet Radio Network
               21      25  EDN         DCEC EDN
               22      26  DIALNET     DIALNET                       [47,48]
               23      27  MITREK      MITREK Cable Network
               24      30  BBN-LOCAL   BBN Local Network
               25      31  RSRE-PPSN   RSRE / PPSN
           26-254  32-376              Unassigned
              255     377              Reserved

    Postel                                                          [Page 5]

    RFC 755                                                       3 May 1979
    IEN 93                                                  Assigned Numbers
    Internet Message Versions

                       ASSIGNED INTERNET MESSAGE VERSIONS

       In the internetwork protocols there is a field to identify the
       version of the internetwork general protocol.  This field is 4 bits
       in size.

       Assigned Internet Message Versions

          Decimal   Octal      Version                            References
          -------   -----      -------                            ----------
              0      0         March 1977 version                       [35]
              1      1         January 1978 version                     [36]
              2      2         February 1978 version A                  [42]
              3      3         February 1978 version B                  [43]
              4      4         February 1979 version 4                  [44]
           5-14   5-16         Unassigned
             15     17         Reserved

    Postel                                                          [Page 6]

    RFC 755                                                       3 May 1979
    IEN 93                                                  Assigned Numbers
    Internet Protocol Numbers

                       ASSIGNED INTERNET PROTOCOL NUMBERS

       In the internet protocol (IN) [44] there is a field to identify the
       the next level protocol.  This field is 8 bits in size.  This field
       is called Protocol in the IN header.

       Assigned Internet Protocol Numbers

          Decimal   Octal      Protocol Numbers                   References
          -------   -----      ----------------                   ----------
               0      0         Reserved
               1      1         raw internet datagrams                  [44]
               2      2         TCP-3                                   [36]
               3      3         Gateway-to-Gateway                      [49]
               4      4         Gateway Monitoring Message              [41]
               5      5         TCP-3.1                                 [45]
               6      6         TCP-4                                   [46]
               7      7         UCL
               8     10         DSP                                  [37,38]
               9     11         Secure
              10     12         TCP-2                                   [35]
           11-12  13-14         Unassigned
              13     15         Pluribus
              14     16         Telenet
              15     17         XNET
              16     20         Chaos
              17     21         UDP                                     [50]
              18     22         Multiplexing                            [51]
          19-254 23-376         Unassigned
             255    377         Reserved

    Postel                                                          [Page 7]

    RFC 755                                                       3 May 1979
    IEN 93                                                  Assigned Numbers
    Internet Message Types

                        ASSIGNED INTERNET MESSAGE TYPES

       In the March 1977 internetwork protocol [35] there is a field to
       identify the type of the message.  This field is 4 bits in size.

       Assigned Internet Message Types

          Decimal   Octal      Type                               References
          -------   -----      ----                               ----------
              0      0         Raw Internet Packet
              1      1         TCP-2                                    [35]
              2      2         Secure
              3      3         Gateway
              4      4         Measurement
              5      5         DSP                                   [37,38]
              6      6         UCL
           7-12   7-14         Reserved
             13     15         Pluribus
             14     16         Telenet
             15     17         Xnet

    Postel                                                          [Page 8]

    RFC 755                                                       3 May 1979
    IEN 93                                                  Assigned Numbers
    References

                                   REFERENCES

       [1]    Feinler, E. and J. Postel, eds., "ARPANET Protocol Handbook,"
              NIC 7104, for the Defense Communications Agency by SRI
              International, Menlo Park, California, Revised January 1978.

       [2]    BBN, "Specifications for the Interconnection of a Host and an
              IMP," Report 1822, Bolt Beranek and Newman, Cambridge,
              Massachusetts, January 1976.

       [3]    McKenzie,A. "Host/Host Protocol for the ARPA Network,"
              NIC 8246, January 1972.  Also in [1].

       [4]    Walden, D. " A System for Interprocess Communication in a
              Resource Sharing Network," RFC 62, NIC 4962, 3 August 1970.
              Also published in Communications of the ACM, volume 15,
              number 4, April 1972.

       [5]    Bressler, B. "A Proposed Experiment with a Message Switching
              Protocol," RFC 333, NIC 9926, 15 May 72.

       [6]    Postel, J. "Telnet Protocol," RFC 318, NIC 9348, 3 April 1972.

       [7]    McKenzie, A. "File Transfer Protocol," RFC 454, NIC 14333,
              16 February 1973.

       [8]    Clements, R. "FTPSRV -- Extensions for Tenex Paged Files,"
              RFC 683, NIC 32251, 3 April 1975.  Also in [1].

       [9]    Harvey, B. "One More Try on the FTP," RFC 691, NIC 32700,
              6 June 1975.

       [10]   Bressler, B. "Remote Job Entry Protocol,"  RFC 407, NIC 12112,
              16 October 72.  Also in [1].

       [11]   Postel, J. "Echo Process,"  RFC 347, NIC 10426, 30 May 1972.

       [12]   Postel, J. "Discard Process,"  RFC 348, NIC 10427,
              30 May 1972.

       [13]   Postel, J. "Character Generator Process," RFC 429, NIC 13281,
              12 December 1972.

       [14]   Neigus, N. "File Transfer Protocol," RFC 542, NIC 17759,
              12 July 1973.  Also in [1].

    Postel                                                          [Page 9]

    RFC 755                                                       3 May 1979
    IEN 93                                                  Assigned Numbers
    References

       [15]   Postel, J. "Revised FTP Reply Codes," RFC 640, NIC 30843,
              5 June 1974.  Also in [1].

       [16]   McKenzie, A. "Telnet Protocol Specification," NIC 18639,
              August 1973.  Also in [1].

       [17]   McKenzie, A. "Telnet Option Specification," NIC 18640,
              August 1973.  Also in [1].

       [18]   White, J. "A High Level Framework for Network-Based Resource
              Sharing," RFC 707, NIC 34263, 14 January 1976. Also in NCC
              Proceedings, AFIPS, June 1976.

       [19]   White, J. "Elements of a Distributed Programming System,"
              RFC 708, NIC 34353, 28 January 1976.

       [20]   COMPASS. "Semi-Annual Technical Report," CADD-7603-0411,
              Massachusetts Computer Associates, 4 March 1976. Also as,
              "National Software Works, Status Report No. 1,"
              RADC-TR-76-276, Volume 1, September 1976. And COMPASS. "Second
              Semi-Annual Report," CADD-7608-1611, Massachusetts Computer
              Associates, 16 August 1976.

       [21]   NSW Protocol Committee, "MSG: The Interprocess Communication
              Facility for the National Software Works," CADD-7612-2411,
              Massachusetts Computer Associates, BBN 3237, Bolt Beranek and
              Newman, Revised 24 December 1976.

       [22]   Harrenstien, K. "Time Server," RFC 738, NIC 42218,
              31 October 1977.  Also in [1].

       [23]   Armenti, A., D. Hall, and A. Stone. "Lincoln Speech Data
              Facility," SUR Note 37, NIC 10917, 14 July 1972.

       [24]   CCA, "Datacomputer Version 1 User Manual," Computer
              Corporation of America, August 1975.

       [25]   Braden, R. "NETRJS Protocol," RFC 740, NIC 42423,
              22 November 1977.  Also in [1].

       [26]   Sproull, R, and E. Thomas. "A Networks Graphics Protocol,"
              NIC 24308, 16 August 1974.  Also in [1].

       [27]   Cerf, V., "NCP Statistics," RFC 388, NIC 11360,
              23 August 1972.

    Postel                                                         [Page 10]

    RFC 755                                                       3 May 1979
    IEN 93                                                  Assigned Numbers
    References

       [28]   Cerf, V., "Formation of a Network Measurement Group (NMG),"
              RFC 323, NIC 9630, 23 March 1972.

       [29]   Bhushan, A., "A Report on the Survey Project," RFC 530,
              NIC 17375, 22 June 1973.

       [30]   Cantor, D., "Storing Network Survey Data at the Datacomputer,"
              RFC 565, NIC 18777, 28 August 1973.

       [31]   Bressler, R., "Inter-Entity Communication -- An Experiment,"
              RFC 441, NIC 13773, 19 January 1973.

       [32]   Thomas, R. "A Resource Sharing Executive for the ARPANET,"
              AFIPS Conference Proceedings, 42:155-163, NCC, 1973.

       [33]   Crispin, M. "SUPDUP Protocol," RFC 734, NIC 41953,
              7 October 1977.  Also in [1].

       [34]   Postel, J. "Official Initial Connection Protocol," NIC 7101,
              11 June 1971.  Also in [1].

       [35]   Cerf, V. "Specification of Internet Transmission Control
              Program -- TCP (version 2)," March 1977.

       [36]   Cerf, V. and J. Postel, "Specification of Internetwork
              Transmission Control Program -- TCP Version 3,"
              USC-Information Sciences Institute, January 1978.

       [37]   Reed, D. "Protocols for the LCS Network," Local Network Note
              3, Laboratory for Computer Science, MIT, 29 November 1976.

       [38]   Clark, D. "Revision of DSP Specification," Local Network Note
              9, Laboratory for Computer Science, MIT, 17 June 1977.

       [39]   Cohen, D. "Specifications for the Network Voice Protocol
              (NVP)," NSC Note 68, 29 January 1976.  Also as USC-Information
              Sciences Institute RR-75-39, March 1976, and as RFC 741,
              NIC 42444, 22 November 1977.  Also in [1].

       [40]   Harrenstien, K. "Name/Finger," RFC 742, NIC 42758,
              30 December 1977.  Also in [1].

       [41]   Cole, J. "Gateway Monitoring Messages," BBN, 1 February 1978.

       [42]   Postel, J. "Draft Internetwork Protocol Specification --
              Version 2," USC-Information Sciences Institute, February 1978.

    Postel                                                         [Page 11]

    RFC 755                                                       3 May 1979
    IEN 93                                                  Assigned Numbers
    References

       [43]   Cerf, V. "A Proposed New Internet Header Format," Advanced
              Research Projects Agency, IEN 26, 14 February 1978.

       [44]   Postel, J. "Internet Datagram Protocol -- Version 4," IEN-80,
              USC-Information Sciences Institute, February 1979.

       [45]   Cerf, V. "A Proposal for TCP Version 3.1 Header Format,"
              Advanced Research Projects Agency, IEN 26, 14 February 1978.

       [46]   Postel, J., "Transmission Control Protocol -- Version 4,"
              IEN-81, USC-Information Sciences Institute, February 1979.

       [47]   McCarthy, J. and L. Earnest, "DIALNET," Stanford University
              Artificial Intelligence Laboratory, Undated.

       [48]   Crispin, M. and I. Zabala, "DIALNET Protocols," Stanford
              University Artificial Intelligence Laboratory, July 1978.

       [49]   Strazisar, V, and R. Perlman, "Gateway Routing, An
              Implementation Specification," IEN-30, Bolt Berenak and
              Newman, April 1978.

       [50]   Postel, J., "User Datagram Protocol," IEN-88, USC-Information
              Sciences Institute, May 1979.

       [51]   Cohen, D. and J. Postel, "Multiplexing Protocol," IEN-90,
              USC-Information Sciences Institute, May 1979.

    Postel                                                         [Page 12]