rfc923.txt

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Reynolds & Postel                                              [Page 13]



Assigned Numbers                                                 RFC 923
Port Numbers


                         ASSIGNED PORT NUMBERS

   Ports are used in the TCP [33,78] to name the ends of logical
   connections which carry long term conversations.  For the purpose of
   providing services to unknown callers, a service contact port is
   defined.  This list specifies the port used by the server process as
   its contact port.  The contact port is sometimes called the
   "well-known port".

   To the extent possible, these same port assignments are used with the
   UDP [33,76].

   The assigned ports use a small portion of the possible port numbers.
   The assigned ports have all except the low order eight bits cleared
   to zero.  The low order eight bits are specified here.

   Port Assignments:

      Decimal   Keyword   Description                         References
      -------   -------   -----------                         ----------
      0                   Reserved                                 [JBP]
      1-4                 Unassigned                               [JBP]
      5        RJE        Remote Job Entry                   [13,34,JBP]
      7        ECHO       Echo                                  [67,JBP]
      9        DISCARD    Discard                               [66,JBP]
      11       USERS      Active Users                          [62,JBP]
      13       DAYTIME    Daytime                               [65,JBP]
      15       NETSTAT    Who is up or NETSTAT                     [JBP]
      17       QUOTE      Quote of the Day                      [72,JBP]
      19       CHARGEN    Character Generator                   [64,JBP]
      20       FTP        File Transfer [Default Data]       [33,68,JBP]
      21       FTP        File Transfer [Control]            [33,68,JBP]
      23       TELNET     Telnet                                [84,JBP]
      25       SMTP       Simple Mail Transfer               [33,74,JBP]
      27       NSW-FE     NSW User System FE                    [18,RHT]
      29       MSG-ICP    MSG ICP                               [60,RHT]
      31       MSG-AUTH   MSG Authentication                    [60,RHT]
      33                  Unassigned                               [JBP]
      35                  any printer server                       [JBP]
      37       TIME       Time                                  [80,JBP]
      39       RLP        Resource Location Protocol              [1,MA]
      41       GRAPHICS   Graphics                           [34,98,JBP]
      42       NAMESERVER Host Name Server                   [33,71,JBP]
      43       NICNAME    Who Is                            [33,42,JAKE]
      44       MPM-FLAGS  MPM FLAGS Protocol                       [JBP]
      45       MPM        Message Processing Module [recv]      [70,JBP]
      46       MPM        MPM [default send]                    [76,JBP]
      47       NI-FTP     NI FTP                                [104,SK]


Reynolds & Postel                                              [Page 14]



Assigned Numbers                                                 RFC 923
Port Numbers


      49       LOGIN      Login Host Protocol                     [PHD1]
      51       LA-MAINT   IMP Logical Address Maintenance       [57,AGM]
      53       DOMAIN     Domain Name Server                       [PM1]
      55       ISI-GL     ISI Graphics Language                 [10,RB6]
      57                  any private terminal access              [JBP]
      59                  any private file service                 [JBP]
      61       NI-MAIL    NI MAIL                                 [8,SK]
      63       VIA-FTP    VIA Systems - FTP                        [DXD]
      65                  Unassigned                               [JBP]
      67                  Unassigned                               [JBP]
      69       TFTP       Trivial File Transfer              [33,87,KRS]
      71       NETRJS     Remote Job Service                 [12,34,RTB]
      72       NETRJS     Remote Job Service                 [12,34,RTB]
      73       NETRJS     Remote Job Service                 [12,34,RTB]
      74       NETRJS     Remote Job Service                 [12,34,RTB]
      75                  any private dial out service             [JBP]
      77                  any private RJE service                  [JBP]
      79       FINGER     Finger                             [34,40,KLH]
      81                  HOSTS2 Name Server                      [EAK1]
      83       HOSTS2-NS  MIT ML Device                            [DPR]
      85       MIT-ML-DEV MIT ML Device                            [DPR]
      87       MIT-ML-DEV Any Private Terminal Link                [JBP]
      89       SU-MIT-TG  SU/MIT Telnet Gateway                    [MRC]
      91       MIT-DOV    MIT Dover Spooler                        [EBM]
      93       DCP        Device Control Protocol                 [DT15]
      95       SUPDUP     SUPDUP                                [21,MRC]
      97       SWIFT-RVF  Swift Remote Vitural File Protocol       [MXR]
      99       METAGRAM   Metagram Relay                          [GEOF]
      101      HOSTNAME   NIC Host Name Server              [33,41,JAKE]
      103                 Unassigned                               [JBP]
      105      CSNET-NS   Mailbox Name Nameserver              [96,MHS1]
      107      RTELNET    Remote Telnet Service                 [73,JBP]
      109      POP        Post Office Protocol                [110,JKR1]
      111      SUNRPC     SUN Remote Procedure Call                [DXG]
      113      AUTH       Authentication Service               [99,MCSJ]
      115      SFTP       Simple File Transfer Protocol         [54,MXL]
      116                 Unassigned                               [JBP]
      117      UUCP-PATH  UUCP Path Service                     [32,MAE]
      118-129             Unassigned                               [JBP]
      131                 Unassigned                               [JBP]
      132-223             Reserved                                 [JBP]
      224-241             Unassigned                               [JBP]
      243      SUR-MEAS   Survey Measurement                      [9,AV]
      245      LINK       LINK                                 [14,RDB2]
      247-255             Unassigned                               [JBP]





Reynolds & Postel                                              [Page 15]



Assigned Numbers                                                 RFC 923
Autonomous System Numbers


                   ASSIGNED AUTONOMOUS SYSTEM NUMBERS

   The Exterior Gateway Protocol (EGP) [93,90] specifies that groups of
   gateways may form autonomous systems.  The EGP provides a 16-bit
   field for identifying such systems.  The values of this field are
   registered here.

   Autonomous System Numbers:

      Decimal   Name                                          References
      -------   ----                                          ----------
            0   Reserved                                           [JBP]
            1   The BBN Gateways                                    [MB]
            2   DCN-AS                                            [DLM1]
            3   The MIT Gateways                                   [LM8]
            4   ISI-AS                                            [JKR1]
            5   Symbolics                                          [CH2]
            6   HIS-Multics                                    [BIM,RK1]
            7   UK-MOD                                            [RNM1]
            8   RICE-AS                                            [PGM]
            9   CMU-ROUTER                                          [MA]
            10  CSNET-PDN-AS                                      [RDR4]
            11  HARVARD                                           [SXB1]
            12  NYU-DOMAIN                                         [EF5]
            13  BRL-AS                                            [RBN1]
            14  COLUMBIA-GW                                       [BC14]
            15  NET DYNAMICS EXP                                   [ZSU]
            16  LBL                                                 [WG]
            17  PURDUE-CS                                         [KCS1]
            18  UTEXAS                                            [JSQ1]
            19  CSS-DOMAIN                                         [RR2]
            20  UR                                                [LB16]
            21  RAND                                               [JDG]
            22  NOSC                                              [RLB3]
            23  RIACS-AS                                          [DG28]
            24  AMES-NAS-GW                                       [MF31]
            25  UCB                                               [MK17]
            26  CORNELL                                            [BN9]
            27  UMDNET                                            [JWO1]
            28  DFVLR-SYS                                         [HDC1]
            29  YALE-AS                                           [JG46]
            30  SRI-AICnet                                         [PM4]
            31  CIT-CS                                            [AD22]
            32  STANFORD                                           [PA5]
            33  DEC-WRL-AS                                        [RKJ2]
            34  UDEL-EECIS                                         [NMM]
            35  MICATON                                            [JN2]
      36-65534  Unassigned                                         [JBP]


Reynolds & Postel                                              [Page 16]



Assigned Numbers                                                 RFC 923
Autonomous System Numbers


        65535   Reserved                                           [JBP]

















































Reynolds & Postel                                              [Page 17]



Assigned Numbers                                                 RFC 923
ARPANET Logical Addresses


                   ASSIGNED ARPANET LOGICAL ADDRESSES

   The ARPANET facility for "logical addressing" is described in
   RFC 878 [56].  A portion of the possible logical addresses are
   reserved for standard uses.

   There are 49,152 possible logical host addresses.  Of these, 256 are
   reserved for assignment to well-known functions.  Assignments for
   well-known functions are made by Joyce Reynolds.  Assignments for
   other logical host addresses are made by the NIC.

   Logical Address Assignments:

      Decimal    Description                                  References
      -------    -----------                                  ----------
      0          Reserved                                          [JBP]
      1          The BBN Gateways                                   [MB]
      2-255      Unassigned                                        [JBP]
      256        Reserved                                          [JBP]































Reynolds & Postel                                              [Page 18]



Assigned Numbers                                                 RFC 923
ARPANET Link Numbers


                     ASSIGNED ARPANET 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.  Later specifications defined this field as the
   "message-id" with a length of 12 bits.  The name link now refers to
   the high order 8 bits of this 12-bit message-id field.  The Host/IMP
   interface is defined in BBN Report 1822 [7].

   The low-order 4 bits of the message-id field are called the sub-link.
   Unless explicitly specified otherwise for a particular protocol,
   there is no sender to receiver significance to the sub-link.  The
   sender may use the sub-link in any way he chooses (it is returned in
   the RFNM by the destination IMP), the receiver should ignore the
   sub-link.

   Link Assignments:

      Decimal   Description                                   References
      -------   -----------                                   ----------
      0         Reserved                                           [JBP]
      1-149     Unassigned                                         [JBP]
      150       Xerox NS IDP                                   [109,LLG]
      151       Unassigned                                         [JBP]
      152       PARC Universal Protocol                         [11,HGM]
      153       TIP Status Reporting                               [JGH]
      154       TIP Accounting                                     [JGH]
      155       Internet Protocol [regular]                  [33,77,JBP]
      156-158   Internet Protocol [experimental]             [33,77,JBP]
      159       Figleaf Link                                      [JBW1]
      160-195   Unassigned                                         [JBP]
      196-247   Experimental Protocols                             [JBP]
      248-255   Network Maintenance                                [JGH]