rfc820.txt

RFC 相关的技术文档

         Total        31        24      1042      1097

      Maximum Allowed

         Class         A         B         C     Total

         Research      8      1024     65536     66568

         Defense      24      3072    458752    461848

         Commercial   94     12286   1572862   1585242

         Total       126     16382   2097150   2113658












Postel                                                          [Page 6]


RFC 820                                                     January 1983
                                                        Assigned Numbers
Internet Version Numbers


                   ASSIGNED INTERNET VERSION NUMBERS

   In the Internet Protocol (IP) [33,62] there is a field to identify
   the version of the internetwork general protocol.  This field is 4
   bits in size.

   Assigned Internet Version Numbers

      Decimal   Octal      Version                            References
      -------   -----      -------                            ----------
          0      0         Reserved                                [JBP]
        1-3    1-3         Unassigned                              [JBP]
          4      4         Internet Protocol                 [33,62,JBP]
          5      5         ST Datagram Mode                     [20,JWF]
       6-14   6-16         Unassigned                              [JBP]
         15     17         Reserved                                [JBP]

                   ASSIGNED INTERNET PROTOCOL NUMBERS

   In the Internet Protocol (IP) [33,62] there is a field, called
   Protocol, to identify the the next level protocol.  This is an 8 bit
   field.

   Assigned Internet Protocol Numbers

      Decimal    Octal      Protocol                          References
      -------    -----      ----------------                  ----------
           0       0         Reserved                              [JBP]
           1       1         ICMP                            [53,62,JBP]
           2       2         Unassigned                            [JBP]
           3       3         Gateway-to-Gateway             [48,49,JFH2]
           4       4         CMCC Gateway Monitoring Message  [18,19,MB]
           5       5         Stream (ST)                        [20,JWF]
           6       6         Transmission Control (TCP)      [34,62,JBP]
           7       7         UCL                                    [PK]
           8      10         Exterior Gateway Protocol (EGP)    [66,RH6]
           9      11         Unassigned                            [JBP]
          10      12         BBN RCC Monitoring                    [SGC]
          11      13         NVP                                [12,SC3]
          12      14         PUP                                [4,EAT3]
       13-14   15-16         Unassigned                            [JBP]
          15      17         Cross Net Debugger (XNET)         [25,JFH2]
          16      20         Chaos Stream                          [NC3]
          17      21         User Datagram (UDP)             [42,62,JBP]
          18      22         Multiplexing                       [13,JBP]
          19      23         DCN Measurement Subsystems           [DLM1]
          20      24         Host Monitoring (HMP)              [55,RH6]
          21      25         Packet Radio Measurement              [ZSU]


Postel                                                          [Page 7]


RFC 820                                                     January 1983
                                                        Assigned Numbers
Internet Protocol Numbers


          22      26         XEROX NS IP                        [59,JBP]
          23      27         Trunk-1                               [BML]
          24      30         Trunk-2                               [BML]
       25-60   31-74         Unassigned                            [JBP]
          61      75         any host internal protocol            [JBP]
          62      76         CFTP                              [60,HCF2]
          63      77         any local network                     [JBP]
          64     100         SATNET and Backroom EXPAK            [DM11]
          65     101         MIT Subnet Support                    [NC3]
          66     102         MIT VAX Remote Disk Protocol          [MBG]
          67     103         Internet Pluribus Packet Core        [DM11]
          68     104         Unassigned                            [JBP]
          69     105         SATNET Monitoring                    [DM11]
          70     106         Unassigned                            [JBP]
          71     107         Internet Packet Core Utility         [DM11]
       72-75 110-113         Unassigned                            [JBP]
          76     114         Backroom SATNET Monitoring           [DM11]
          77     115         Unassigned                            [JBP]
          78     116         WIDEBAND Monitoring                  [DM11]
          79     117         WIDEBAND EXPAK                       [DM11]
      80-254 120-376         Unassigned                            [JBP]
         255     377         Reserved                              [JBP]




























Postel                                                          [Page 8]


RFC 820                                                     January 1983
                                                        Assigned Numbers
Port Numbers


                         ASSIGNED PORT NUMBERS

   Ports are used in the TCP [34,62] 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
   UDP [42,62].

   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   Octal     Description                         References
      -------   -----     -----------                         ----------
      1         1         Old Telnet                            [40,JBP]
      3         3         Old File Transfer               [27,11,24,JBP]
      5         5         Remote Job Entry                    [6,17,JBP]
      7         7         Echo                                  [35,JBP]
      9         11        Discard                               [32,JBP]
      11        13        Who is on or SYSTAT                      [JBP]
      13        15        Date and Time                            [JBP]
      15        17        Who is up or NETSTAT                     [JBP]
      17        21        Short Text Message                       [JBP]
      19        23        Character generator or TTYTST         [31,JBP]
      20        24        File Transfer (Default Data)       [36,62,JBP]
      21        25        File Transfer (Control)            [36,62,JBP]
      23        27        Telnet                             [41,62,JBP]
      25        31        SMTP                               [54,62,JBP]
      27        33        NSW User System FE                    [14,RHT]
      29        35        MSG ICP                               [29,RHT]
      31        37        MSG Authentication                    [29,RHT]
      33        41        Unassigned                               [JBP]
      35        43        IO Station Spooler                       [JBP]
      37        45        Time Server                           [22,JBP]
      39        47        Unassigned                               [JBP]
      41        51        Graphics                           [46,17,JBP]
      42        52        Name Server                        [38,62,JBP]
      43        53        WhoIs                             [57,62,JAKE]
      45        55        Message Processing Module (receive)   [37,JBP]
      46        56        MPM (default send)                    [37,JBP]
      47        57        NI FTP                                 [50,SK]
      49-53     61-65     Unassigned                               [JBP]


Postel                                                          [Page 9]


RFC 820                                                     January 1983
                                                        Assigned Numbers
Port Numbers


      55        67        ISI Graphics Language                  [3,RB6]
      57        71        Unassigned                               [JBP]
      59        73        Augment File Mover                       [WWB]
      61        75        NIMAIL                                 [56,SK]
      63        77        Unassigned                               [JBP]
      65        101       Unassigned                               [JBP]
      67        103       Datacomputer at CCA                    [8,JZS]
      69        105       Trivial File Transfer              [47,62,KRS]
      71        107       NETRJS                              [5,17,RTB]
      72        110       NETRJS                              [5,17,RTB]
      73        111       NETRJS                              [5,17,RTB]
      74        112       NETRJS                              [5,17,RTB]
      75        113       Unassigned                               [JBP]
      77        115       any private RJE server                   [JBP]
      79        117       Name or Finger                     [23,17,KLH]
      81        121       HOSTS2 Name Server                      [EAK1]
      83        123       MIT ML Device                            [DPR]
      85        125       MIT ML Device                            [DPR]
      87        127       any terminal link                        [JBP]
      89        131       SU/MIT Telnet Gateway                    [MRC]
      91        133       MIT Dover Spooler                        [EBM]
      93        135       Device Control Protocol                  [DCT]
      95        137       SUPDUP                                [15,MRC]
      97        141       Datacomputer Status                    [8,JZS]
      99        143       Metagram Relay                          [GEOF]
      101       145       NIC Host Name Server              [64,62,JAKE]
      103       147       CSNET Mailbox Name Server (Telnet)   [58,MHS1]
      105       151       CSNET Mailbox Name Server (Program)  [58,MHS1]
      107       153       Remote Telnet Service                 [61,JBP]
      109-129   155-201   Unassigned                               [JBP]
      131       203       Datacomputer                           [8,JZS]
      132-223   204-337   Reserved                                 [JBP]
      224-241   340-361   Unassigned                               [JBP]
      243       363       Survey Measurement                      [2,AV]
      245       365       LINK                                  [7,RDB2]
      247-255   367-377   Unassigned                               [JBP]














Postel                                                         [Page 10]


RFC 820                                                     January 1983
                                                        Assigned Numbers
Autonomous System Numbers


                   ASSIGNED AUTONOMOUS SYSTEM NUMBERS

   The Exterior Gateway Protocol (EGP) [66] specifies that groups of
   gateways may for 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   Description                                   References
      -------   -----------                                   ----------
            0   Reserved                                           [JBP]
            1   The BBN Gateways                                   [JBP]
      2-65534   Unassigned                                         [JBP]
        65535   Reserved                                           [JBP]

                     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.  Some time after the ARPANET Host-to-Host (AHHP) protocol
   was defined and, by now some years 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 [1].

   Link Assignments:

      Decimal   Octal     Description                         References
      -------   -----     -----------                         ----------
      0         0         AHHP Control Messages              [28,17,JBP]
      1         1         Reserved                                 [JBP]
      2-71      2-107     AHHP Regular Messages              [28,17,JBP]
      72-149    110-225   Reserved                                 [JBP]
      150       226       Xerox NS IP                           [59,LLG]
      151       227       Unassigned                               [JBP]
      152       230       PARC Universal Protocol               [4,EAT3]
      153       231       TIP Status Reporting                     [JGH]
      154       232       TIP Accounting                           [JGH]
      155       233       Internet Protocol (regular)        [33,62,JBP]
      156-158   234-236   Internet Protocol (experimental)   [33,62,JBP]
      159-195   237-303   Unassigned                               [JBP]
      196-255   304-377   Experimental Protocols                   [JBP]
      248-255   370-377   Network Maintenance                      [JGH]




Postel                                                         [Page 11]


RFC 820                                                     January 1983