rfc790.txt

RFC 相关的技术文档

Network Working Group                                          J. Postel
Request for Comments: 790                                            ISI
                                                          September 1981

Obsoletes RFCs:  776, 770, 762, 758,
755, 750, 739, 604, 503, 433, 349
Obsoletes IENs:  127, 117, 93



                            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, port, protocol,
or network number please contact Jon to receive a number assignment.

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

   phone: [phone]

   ARPANET mail: POSTEL@ISIF

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 [17] prepared by the Network Information Center (NIC).
Some of the items listed are undocumented.  In all cases the name and
mailbox of the responsible individual is indicated.  In the lists that
follow, a bracketed entry, e.g., [17,iii], at the right hand margin of
the page indicates a reference for the listed protocol, where the number
cites the document and the "iii" cites the person.














Postel                                                          [Page 1]


RFC 790                                                   September 1981
                                                        Assigned Numbers
Network Numbers


                        ASSIGNED NETWORK NUMBERS

   This list of network numbers is used in the internet address [33].
   The Internet Protocol (IP) uses a 32 bit address and divides that
   address into a network part and a "rest" or local address part.  The
   division takes 3 forms or classes.

      The first type, or class a, of address has a 7-bit network number
      and a 24-bit local address.  This allows 128 class a networks.

                           1                   2                   3   
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |0|   NETWORK   |                Local Address                  |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                             Class A Address

      The second type, or class b, of address has a 14-bit network
      number and a 16-bit local address.  This allows 16,384 class b
      networks.

                           1                   2                   3   
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |1 0|           NETWORK         |          Local Address        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                             Class B Address

      The third type, or class c, of address has a 21-bit network number
      and a 8-bit local address.  This allows 2,097,152 class c
      networks.

                           1                   2                   3   
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |1 1 0|                    NETWORK              | Local Address |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                             Class C Address

   One notation for internet host addresses commonly used divides the
   32-bit address into four 8-bit fields and specifies the value of each
   field as a decimal number with the fields separated by periods.  For
   example, the internet address of ISIF is 010.020.000.052.

   This notation will be used in the listing of assigned network


Postel                                                          [Page 2]


RFC 790                                                   September 1981
                                                        Assigned Numbers
Network Numbers


   numbers.  The class a networks will have nnn.rrr.rrr.rrr, the class b
   networks will have nnn.nnn.rrr.rrr, and the class c networks will
   have nnn.nnn.nnn.rrr, where nnn represents part or all of a network
   number and rrr represents part or all of a local address or rest
   field.

   Assigned Network Numbers

   Class A Networks

      Internet Address  Name          Network                 References
      ----------------  ----          -------                 ----------
      000.rrr.rrr.rrr                 Reserved                     [JBP]
      001.rrr.rrr.rrr   BBN-PR        BBN Packet Radio Network    [DCA2]
      002.rrr.rrr.rrr   SF-PR-1       SF Packet Radio Network (1)  [JEM]
      003.rrr.rrr.rrr   BBN-RCC       BBN RCC Network              [SGC]
      004.rrr.rrr.rrr   SATNET        Atlantic Satellite Network  [DM11]
      005.rrr.rrr.rrr   SILL-PR       Ft. Sill Packet Radio Network[JEM]
      006.rrr.rrr.rrr   SF-PR-2       SF Packet Radio Network (2)  [JEM]
      007.rrr.rrr.rrr   CHAOS         MIT CHAOS Network           [MOON]
      008.rrr.rrr.rrr   CLARKNET      SATNET subnet for Clarksburg[DM11]
      009.rrr.rrr.rrr   BRAGG-PR      Ft. Bragg Packet Radio Net   [JEM]
      010.rrr.rrr.rrr   ARPANET       ARPANET                 [17,1,VGC]
      011.rrr.rrr.rrr   UCLNET        University College London     [PK]
      012.rrr.rrr.rrr   CYCLADES      CYCLADES                     [VGC]
      013.rrr.rrr.rrr                 Unassigned                   [JBP]
      014.rrr.rrr.rrr   TELENET       TELENET                      [VGC]
      015.rrr.rrr.rrr   EPSS          British Post Office EPSS      [PK]
      016.rrr.rrr.rrr   DATAPAC       DATAPAC                      [VGC]
      017.rrr.rrr.rrr   TRANSPAC      TRANSPAC                     [VGC]
      018.rrr.rrr.rrr   LCSNET        MIT LCS Network       [43,10,DDC2]
      019.rrr.rrr.rrr   TYMNET        TYMNET                       [VGC]
      020.rrr.rrr.rrr   DC-PR         D.C. Packet Radio Network    [VGC]
      021.rrr.rrr.rrr   EDN           DCEC EDN                     [EC5]
      022.rrr.rrr.rrr   DIALNET       DIALNET                [26,16,MRC]
      023.rrr.rrr.rrr   MITRE         MITRE Cablenet            [44,APS]
      024.rrr.rrr.rrr   BBN-LOCAL     BBN Local Network            [SGC]
      025.rrr.rrr.rrr   RSRE-PPSN     RSRE / PPSN                  [BD2]
      026.rrr.rrr.rrr   AUTODIN-II    AUTODIN II                   [EC5]
      027.rrr.rrr.rrr   NOSC-LCCN     NOSC / LCCN                  [KTP]
      028.rrr.rrr.rrr   WIDEBAND      Wide Band Satellite Network [CJW2]
      029.rrr.rrr.rrr   DCN-COMSAT    COMSAT Dist. Comp. Network  [DLM1]
      030.rrr.rrr.rrr   DCN-UCL       UCL Dist. Comp. Network       [PK]
      031.rrr.rrr.rrr   BBN-SAT-TEST  BBN SATNET Test Network     [DM11]
      032.rrr.rrr.rrr   UCL-CR1       UCL Cambridge Ring 1          [PK]
      033.rrr.rrr.rrr   UCL-CR2       UCL Cambridge Ring 2          [PK]
      034.rrr.rrr.rrr   MATNET        Mobile Access Terminal Net  [DM11]
      035.rrr.rrr.rrr   NULL          UCL/RSRE Null Network        [BD2]


Postel                                                          [Page 3]


RFC 790                                                   September 1981
                                                        Assigned Numbers
Network Numbers


      036.rrr.rrr.rrr   SU-NET        Stanford University Ethernet [MRC]
      037.rrr.rrr.rrr   DECNET        Digital Equipment Network    [DRL]
      038.rrr.rrr.rrr   DECNET-TEST   Test Digital Equipment Net   [DRL]
      039.rrr.rrr.rrr   SRINET        SRI Local Network           [GEOF]
      040.rrr.rrr.rrr   CISLNET       CISL Multics Network         [CH2]
      041.rrr.rrr.rrr   BBN-LN-TEST   BBN Local Network Testbed    [KTP]
      042.rrr.rrr.rrr   S1NET         LLL-S1-NET                   [EAK]
      043.rrr.rrr.rrr   INTELPOST     COMSAT INTELPOST            [DLM1]
      044.rrr.rrr.rrr   AMPRNET       Amature Radio Experiment Net  [HM]
      044.rrr.rrr.rrr-126.rrr.rrr.rrr Unassigned                   [JBP]
      127.rrr.rrr.rrr                 Reserved                     [JBP]

   Class B Networks

      Internet Address  Name          Network                 References
      ----------------  ----          -------                 ----------
      128.000.rrr.rrr                 Reserved                     [JBP]
      128.001.rrr.rrr-128.254.rrr.rrr Unassigned                   [JBP]
      191.255.rrr.rrr                 Reserved                     [JBP]

   Class C Networks

      Internet Address  Name          Network                 References
      ----------------  ----          -------                 ----------
      192.000.001.rrr                 Reserved                     [JBP]
      192.000.001.rrr-223.255.254.rrr Unassigned                   [JBP]
      223.255.255.rrr                 Reserved                     [JBP]

   Other Reserved Internet Addresses

      Internet Address  Name          Network                 References
      ----------------  ----          -------                 ----------
      224.000.000.000-255.255.255.255 Reserved                     [JBP]

















Postel                                                          [Page 4]


RFC 790                                                   September 1981
                                                        Assigned Numbers
Internet Version Numbers


                   ASSIGNED INTERNET VERSION NUMBERS

   In the Internet Protocol (IP) [33] 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,JBP]
          5      5         ST Datagram Mode                     [20,JWF]
       6-14   6-16         Unassigned                              [JBP]
         15     17         Reserved                                [JBP]


































Postel                                                          [Page 5]