Socket number list
RFC 503

Document Type RFC - Unknown (April 1973; No errata)
Obsoleted by RFC 739
Obsoletes RFC 433
Last updated 2013-03-02
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Network Working Group                                          N. Neigus
Request for Comments: 503                                      J. Postel
NIC: 15747                                                 13 April 1973
References: 349, 433

                           Socket Number List

   This is a second pass at the specification of the socket numbers.
   More sockets have been made available for experimental functions,
   some new sockets have been assigned for network standard functions,
   host specific functions and experimental functions, and the list of
   available sockets for server hosts has been updated.

   Following are the current assignments for socket numbers used for
   public functions.  Note that a socket number is a 40 bit quantity,
   the first 8 bits being the host specification, the next 24 bits being
   site specific, and the last 8 bits being user specified -- these last
   8 bits are called the AEN [it stands for, cleverly enough, Another
   Eightbit Number].

   For the assignments here the value in the host field ranges across al
   hosts (unless otherwise specified), the value in the 24 bit field is
   zero, and the AEN is indicated here.

General Assignments:

   Sockets             Assignment

   0 - 63              Network Wide Standard Functions
   64 - 127            Host Specific Functions
   128 - 223           Reserved for Future Use
   224 - 255           Any Experimental Function

Neigus, et. al.                                                 [Page 1]
RFC 503                    Socket Number List              13 April 1973

Particular Assignments:

   Socket              Assignment

     1                 Telnet
     3                 File Transfer
     5                 Remote Job Entry
     7                 Echo
     9                 Discard
    11                 Systat or who-is-on function
    13                 Date-Time function
    15                 Netstat or who-is-up function
    19                 Character Generator [e.g. TTYTST]

    65                 Speech Data Base @ 11-tx-2 (74)
    67
    69                 CPYNET
    71                 NETRJS [EBCDIC]
    73                 NETRJS [ASCII]
    75                 NETRJS [TTY]

   241                 NCP Measurement
   243                 Survey Measurement
   245                 LINK
   247                 RSEXEC
   249                 RSEXEC
   251                 RSEXEC

   The specifications for the assigned functions can be found in the
   documents listed here:

   Telnet                   NIC 7104
   File Transfer            NIC 7104
   Remote Job Entry         NIC 7104
   Echo                     RFC 347
   Discard                  RFC 348
   Character Generator      RFC 429
   Speech Data Base         SUR 37
   Datacomputer             [Murray @ CCA]
   NCP Measurement          RFC 388
   Survey Data              [Kampa @ NMC]
   LINK                     [Bressler @ BBN]
   RSEXEC                   [Thomas @ BBN]

   There are several hosts performing public services on sockets which
   conflict with the above scheme.  We hope we can resolve these
   conflicts with a minimum of disruption.

Neigus, et. al.                                                 [Page 2]
RFC 503                    Socket Number List              13 April 1973

   The following is a tabulation of socket numbers together with the
   services offered.  This listing is presented as an aid to network
   users.  If you know of a socket function which has been left out or
   an entry which should be corrected or deleted please contact:

   Jon Postel
   3804 Boelter Hall
   Computer Science Department
   University of California
   Los Angeles, CA. 90024

   Phone: (213) 825-2368

   NIC Ident - JBP

         or

   Nancy J. Neigus
   Bolt Beranek and Newman
   50 Moulton Street
   Cambridge, Mass. 02138

   Phone: (617) 661-0100

   NIC Ident = NJN

   We will be pleased to include socket/function information for other
   than "official" sockets [e.g. Tip News].

   1   UCLA-NMC

       1      Telnet
       3      File Transfer
       241    NCP Measurement
       243    Survey Data

   2   SRI-ARC

       1      Telnet
       3      File Transfer
       7      Echo
       11     SYSTAT
       13     DATE-TIME
       69     CPYNET

Neigus, et. al.                                                 [Page 3]
RFC 503                    Socket Number List              13 April 1973

   3   UCSB

       1      Telnet
       5      UCSB RJS [not ARPANET standard]
       7      Echo
       9      Discard

       1793, 1795, 1797, 1799, 1801, 2049 Graphics terminal sockets
       x'701', '703', '705', '707', '709', '801' o'3401', '3403',
       '3405', '3407', '3411', '4001'

       4   UTAH

           1      Telnet
           3      File Transfer
           5      Echo
           7      CPYNET
           9      SYSTAT
           13     DATE-TIME

       6   MIT-Multics

           1      Telnet
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