rfc900.txt

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                   ASSIGNED AUTONOMOUS SYSTEM NUMBERS

   The Exterior Gateway Protocol (EGP) [85,84] 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                                             [PXK]
            5   Symbolics                                          [CH2]
            6   HIS-Multics                                    [BIM,RK1]
            7   UK-MOD                                            [RNM1]
            8   RICE-AS                                            [PGM]
            9   CMU-ROUTER                                          [MA]
      10-65534  Unassigned                                         [JBP]
        65535   Reserved                                           [JBP]



























Reynolds & Postel                                              [Page 15]



Assigned Numbers                                                 RFC 900
ARPANET Logical Addresses


                   ASSIGNED ARPANET LOGICAL ADDRESSES

   The ARPANET facility for "logical addressing" is described in RFC 878
   [49].  A portion of the possible logical addresses are reseved 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 16]



Assigned Numbers                                                 RFC 900
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                                    [97,LLG]
      151       Unassigned                                         [JBP]
      152       PARC Universal Protocol                         [11,HGM]
      153       TIP Status Reporting                               [JGH]
      154       TIP Accounting                                     [JGH]
      155       Internet Protocol [regular]                  [31,71,JBP]
      156-158   Internet Protocol [experimental]             [31,71,JBP]
      159       Figleaf Link                                      [JBW1]
      160-195   Unassigned                                         [JBP]
      196-247   Experimental Protocols                             [JBP]
      248-255   Network Maintenance                                [JGH]

















Reynolds & Postel                                              [Page 17]



Assigned Numbers                                                 RFC 900
IEEE 802 SAP Numbers


                    IEEE 802 SAP NUMBERS OF INTEREST

   Many of the networks of all classes are IEEE 802 Networks.  These
   systems use a Service Access Point field in much the same way the
   ARPANET uses the "link" field.

   Assignments:

      Service Access Point               Description          References
      --------------------               -----------          ----------
      decimal  binary
         96   01100000                   DOD IP              [31,70,JBP]






































Reynolds & Postel                                              [Page 18]



Assigned Numbers                                                 RFC 900
Ethernet Numbers


                      ETHERNET NUMBERS OF INTEREST

   Many of the networks of all classes are Ethernets (10Mb) or
   Experimental Ethernets (3Mb).  These systems use a message "type"
   field in much the same way the ARPANET uses the "link" field.

   Assignments:

      Ethernet          Exp. Ethernet    Description          References
      -------------     -------------   -----------           ----------
      decimal  Hex      decimal  octal
         512   0200        512   1000   XEROX PUP                [1,HGM]
        1536   0600       1536   3000   XEROX NS IDP            [97,LLG]
        2048   0800        513   1001   DOD IP              [131,71,JBP]
        2049   0801        -      -     X.75 Internet              [LLG]
        2050   0802        -      -     NBS Internet               [LLG]
        2051   0803        -      -     ECMA Internet              [LLG]
        2052   0804        -      -     Chaosnet                   [LLG]
        2053   0805        -      -     X.25 Level 3               [LLG]
        2054   0806        -      -     Address Res            [55,DCP1]
        2076   081C        -      -     Symbolics Private         [DCP1]
       32771   8003        -      -     Cronus VLN              [91,DCT]
       32772   8004        -      -     Cronus Direct           [91,DCT]
       32774   8006        -      -     Nestar                     [LLG]
       36864   9000        -      -     Loopback                   [LLG]

   The standard for transmission of IP datagrams over Ethernets and
   Experimental Ethernets is specified in RFC 894 [41] and RFC 895 [57]
   respectively.





















Reynolds & Postel                                              [Page 19]



Assigned Numbers                                                 RFC 900
Address Resolution Protocol


            ASSIGNED ADDRESS RESOLUTION PROTOCOL PARAMETERS

   The Address Resolution Protocol (ARP) specified in RFC 826 [55] has
   several parameters.  The assigned values for these parameters are
   listed here.

   Assignments:

      Operation Code (op)

         1   REQUEST
         2   REPLY

      Hardware Type (hrd)

         1   ETHERNET (10Mb)
         2   EXPERIMENTAL ETHERNET (3Mb)

      Protocol Type (pro)

         Use the same codes as listed in the section called "Ethernet
         Numbers of Interest".




























Reynolds & Postel                                              [Page 20]



Assigned Numbers                                                 RFC 900
Public Data Network Numbers


                  ASSIGNED PUBLIC DATA NETWORK NUMBERS

   One of the Internet Class A Networks is the international system of
   Public Data Networks.  This section lists the mapping between the
   Internet Addresses and the Public Data Network Addresses (X.121).

   Assignments:

      Internet           Public Data Net    Description       References
      ---------------   -----------------   -----------       ----------
      014.000.000.000                       Reserved               [JBP]
      014.000.000.001   3110-317-00035 00   PURDUE-TN              [CAK]
      014.000.000.002   3110-608-00027 00   UWISC-TN               [CAK]
      014.000.000.003   3110-302-00024 00   UDEL-TN                [CAK]
      014.000.000.004   2342-192-00149 23   UCL-VTEST               [PK]
      014.000.000.005   2342-192-00300 23   UCL-TG                  [PK]
      014.000.000.006   2342-192-00300 25   UK-SATNET               [PK]
      014.000.000.007   3110-608-00024 00   UWISC-IBM             [MHS1]
      014.000.000.008   3110-213-00045 00   RAND-TN                [MO2]
      014.000.000.009   2342-192-00300 23   UCL-CS                  [PK]
      014.000.000.010   3110-617-00025 00   BBN-VAN-GW            [JD21]
      014.000.000.011   2405-015-50300 00   CHALMERS               [UXB]
      014.000.000.012   3110-713-00165 00   RICE                  [PAM6]
      014.000.000.013   3110-415-00261 00   DECWRL                [PAM6]
      014.000.000.014   3110-408-00051 00   IBM-SJ                 [SA1]
      014.000.000.015   2041-117-01000 00   SHAPE                  [PG3]
      014.000.000.016   2628-153-90075 00   DFVLR                 [HDC1]
      014.000.000.017-014.255.255.254       Unassigned             [JBP]
      014.255.255.255                       Reserved               [JBP]

   The standard for transmission of IP datagrams over the Public Data
   Network is specified in RFC 877 [47].


















Reynolds & Postel                                              [Page 21]



Assigned Numbers                                                 RFC 900
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