rfc1166.txt

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                                 Class D Address


      Note:  No addresses are allowed with the four highest-order bits
      set to 1-1-1-1.  These addresses, called "class E", are reserved.

   One commonly used notation for internet host addresses 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.  This
   is called the "dotted decimal" notation.  For example, the internet
   address of VENERA.ISI.EDU in dotted decimal is 128.009.000.032, or
   128.9.0.32.

   The dotted decimal notation will be used in the listing of assigned
   network 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.

   There are four catagories of users of Internet Addresses: Research,
   Defense, Government (Non-Defense), and Commercial.  To reflect the
   allocation of network identifiers among the categories, a one-
   character code is placed to the left of the network number: R for
   Research, D for Defense, G for Government, and C for Commercial (see
   Appendix A for further details on this division of the network
   identification).

   Network numbers are assigned for networks that are connected to the
   research Internet and operational Internet, and for independent
   networks that use the IP family protocols (these are usually
   commercial).  These independent networks are marked with an asterisk
   preceding the number.

   The administrators of independent networks must apply separately for
   permission to interconnect their network with the Internet.
   Independent networks should not be listed in the working tables of
   the Internet hosts or gateways.




Kirkpatrick, Stahl & Recker                                     [Page 5]

RFC 1166                    Internet Numbers                   July 1990


   For various reasons, the assigned numbers of networks are sometimes
   changed.  To ease the transition the old number will be listed for a
   transition period as well.  These "old number" entries will be marked
   with a "T" following the number and preceding the name, and the
   network name will be suffixed "-TEMP".

   Special Addresses:

      In certain contexts, it is useful to have fixed addresses with
      functional significance rather than as identifiers of specific
      hosts.

         The address zero is to be interpreted as meaning "this", as in
         "this network".

            For example, the address 0.0.0.37 could be interpreted as
            meaning host 37 on this network.

         The address of all ones are to be interpreted as meaning "all",
         as in "all hosts".

            For example, the address 128.9.255.255 could be interpreted
            as meaning all hosts on the network 128.9.

         The class A network number 127 is assigned the "loopback"
         function, that is, a datagram sent by a higher level protocol
         to a network 127 address should loop back inside the host.  No
         datagram "sent" to a network 127 address should ever appear on
         any network anywhere.






















Kirkpatrick, Stahl & Recker                                     [Page 6]

RFC 1166                    Internet Numbers                   July 1990


Class A Networks

      * Internet Address                   Network           Reference
      - ----------------                   -------           ----------
       *0.rrr.rrr.rrr                      Reserved          [JBP]
        1.rrr.rrr.rrr-2.rrr.rrr.rrr        Unassigned        [NIC]
      C*3.rrr.rrr.rrr                      GE-INTERNET       [JEB50]
      R 4.rrr.rrr.rrr                      SATNET            [SHB]
        5.rrr.rrr.rrr                      Unassigned        [NIC]
      D 6.rrr.rrr.rrr                      YPG-NET           [BWA]
      D 7.rrr.rrr.rrr                      EDN-TEMP          [EC5]
      R 8.rrr.rrr.rrr                      BBNCCNET          [SGC]
      R 9.rrr.rrr.rrr                      IBM               [JP247]
      R 10.rrr.rrr.rrr                     ARPANET           [JS283]
      D 11.rrr.rrr.rrr                     DODIIS            [GEG4]
      C 12.rrr.rrr.rrr                     ATT               [MH82]
      C 13.rrr.rrr.rrr                     XEROX-NET         [SJ33]
      C 14.rrr.rrr.rrr                     PDN               [JKR1]
      R 15.rrr.rrr.rrr                     HP-INTERNET       [WU1]
      C 16.rrr.rrr.rrr                     DEC-INTERNET      [BKR]
        17.rrr.rrr.rrr                     Unassigned        [NIC]
      R 18.rrr.rrr.rrr                     MIT-TEMP          [JIS]
      C*19.rrr.rrr.rrr                     FINET             [RJB3]
      D*20.rrr.rrr.rrr                     ANALYTICS         [BD107]
      D 21.rrr.rrr.rrr                     DDN-RVN           [MLC]
      D*22.rrr.rrr.rrr                     DSNET1            [GEG4]
      D 23.rrr.rrr.rrr                     DDN-TC-NET        [DH17]
        24.rrr.rrr.rrr                     Unassigned        [NIC]
      R 25.rrr.rrr.rrr                     RSRE-EXP          [DBH11]
      D 26.rrr.rrr.rrr                     MILNET            [TMH6]
      R 27.rrr.rrr.rrr                     NOSC-LCCN-TEMP    [RH6]
      R 28.rrr.rrr.rrr                     WIDEBAND          [CJW2]
      D 29.rrr.rrr.rrr                     MILX25-TEMP       [TMH6]
      D 30.rrr.rrr.rrr                     ARPAX25-TEMP      [TMH6]
      G 31.rrr.rrr.rrr                     UCDLA-NET         [CL64]
        32.rrr.rrr.rrr-34.rrr.rrr.rrr      Unassigned        [NIC]
      R 35.rrr.rrr.rrr                     MERIT             [HWB]
      R 36.rrr.rrr.rrr                     SU-NET-TEMP       [VAF]
        37.rrr.rrr.rrr-40.rrr.rrr.rrr      Unassigned        [NIC]
      R 41.rrr.rrr.rrr                     BBN-TEST-A        [RH6]
      R 42.rrr.rrr.rrr                     CAN-INET          [MV38]
      R*43.rrr.rrr.rrr                     JAPAN-A           [JM292]
      R 44.rrr.rrr.rrr                     AMPRNET           [PK28]
        45.rrr.rrr.rrr                     Reserved          [NIC]
      C 46.rrr.rrr.rrr                     BBNET             [JSG1]
      R 47.rrr.rrr.rrr                     BNR               [BM178]
        48.rrr.rrr.rrr-126.rrr.rrr.rrr     Unassigned        [NIC]
       *127.rrr.rrr.rrr                    Loopback          [JBP]



Kirkpatrick, Stahl & Recker                                     [Page 7]

RFC 1166                    Internet Numbers                   July 1990


Class B Networks

      * Internet Address                   Network           Reference
      - ----------------                   -------           ----------
        128.0.rrr.rrr                      Reserved          [JBP]
      R 128.1.rrr.rrr                      BBN-TEST-B        [RH6]
      R 128.2.rrr.rrr                      CMU-NET           [HDW2]
      R 128.3.rrr.rrr                      LBL-IP-NET1       [CAL3]
      R 128.4.rrr.rrr                      DCNET             [DLM1]
      R 128.5.rrr.rrr                      FORDNET           [FJB3]
      R 128.6.rrr.rrr                      RUTGERS           [CLH3]
      R 128.7.rrr.rrr                      KRAUTNET          [GB7]
      R 128.8.rrr.rrr                      UMDNET            [LAM1]
      R 128.9.rrr.rrr                      ISI-NET           [VLG]
      R 128.10.rrr.rrr                     PURDUE-CS-EN      [DT50]
      R 128.11.rrr.rrr                     BBN-CRONUS        [PK19]
      R 128.12.rrr.rrr                     SU-NET            [VAF]
      D 128.13.rrr.rrr                     MATNET            [SHB]
      R 128.14.rrr.rrr                     BBN-SAT-TEST      [SHB]
      R 128.15.rrr.rrr                     S1NET             [RAK12]
      R 128.16.rrr.rrr                     UCL-CS-ETHER      [PK]
      D 128.17.rrr.rrr                     MATNET-ALT        [SHB]
      R 128.18.rrr.rrr                     SRINET            [TONY]
      D 128.19.rrr.rrr                     EDN               [EC5]
      D 128.20.rrr.rrr                     BRLNET            [TS9]
      R 128.21.rrr.rrr                     SRI-PR-1          [PEM4]
      R 128.22.rrr.rrr                     SRI-PR-2          [PEM4]
      R*128.23.rrr.rrr                     MUSC              [SB228]
      R 128.24.rrr.rrr                     ROCKWELL-PR       [JCJ1]
      D 128.25.rrr.rrr                     BRAGG-PR          [LDB3]
      D 128.26.rrr.rrr                     SAPE-AIRNET       [CAD13]
      D 128.27.rrr.rrr                     DEMO-PR-1         [DM261]
      D 128.28.rrr.rrr                     C3-PR-TEMP        [GMR]
      R 128.29.rrr.rrr                     MITRE             [TML]
      R 128.30.rrr.rrr                     MIT-NET           [DDC1]
      R 128.31.rrr.rrr                     MIT-RES           [DDC1]
      R 128.32.rrr.rrr                     UCB-ETHER         [RWH5]
      R 128.33.rrr.rrr                     BBN-NET           [SGC]
      R 128.34.rrr.rrr                     NOSC-LCCN         [RH6]
      R 128.35.rrr.rrr                     BULLUSANET        [JLM23]
      R 128.36.rrr.rrr                     YALE-NET          [HML1]
      D 128.37.rrr.rrr                     YUMA              [RBB2]
      D 128.38.rrr.rrr                     NSWC-NET          [VHB]
      R 128.39.rrr.rrr                     NTANET            [PS27]
      R 128.40.rrr.rrr                     UCL-ETHERNET      [JA168]
      R 128.41.rrr.rrr                     UCL-CS-SERVICE    [JA168]
      R 128.42.rrr.rrr                     RICE-NET          [FG50]
      R 128.43.rrr.rrr                     DRENET            [JS597]



Kirkpatrick, Stahl & Recker                                     [Page 8]

RFC 1166                    Internet Numbers                   July 1990


      D 128.44.rrr.rrr                     WSMR-NET1         [CAS1]
      C 128.45.rrr.rrr                     DEC-WRL-NET       [BKR]
      R 128.46.rrr.rrr                     PURDUE-NET        [JRS8]
      D 128.47.rrr.rrr                     TACTNET           [MB31]
      G 128.48.rrr.rrr                     UCDLA-NET-B       [CL64]
      R 128.49.rrr.rrr                     NOSC-ETHER        [RLB3]
      G 128.50.rrr.rrr                     COINS             [RLS6]
      G 128.51.rrr.rrr                     COINSTNET         [RLS6]
      R 128.52.rrr.rrr                     MIT-AI-NET        [CL11]
      R 128.53.rrr.rrr                     SAC-PR-2          [GMR]
      R 128.54.rrr.rrr                     UCSD              [GH29]
      R 128.55.rrr.rrr                     NMFECC            [RJA21]
      D 128.56.rrr.rrr                     USNA-NET          [RAD15]
      D 128.57.rrr.rrr                     DEMO-PR-2         [DM261]
      C 128.58.rrr.rrr                     SLCS              [CG64]
      R 128.59.rrr.rrr                     CU-NET            [BC14]
      D 128.60.rrr.rrr                     NRL-ETHER         [WF3]
      R 128.61.rrr.rrr                     GATECH            [DD11]
      R 128.62.rrr.rrr                     MCC-NET           [CBD]
      R 128.63.rrr.rrr                     BRL-SUBNET        [TS9]
        128.64.rrr.rrr-128.79.rrr.rrr      Unassigned        [NIC]
      D 128.80.rrr.rrr                     CECOMNET          [PFS2]
      R 128.81.rrr.rrr                     SYMBOLICS         [SE31]
      R 128.82.rrr.rrr                     ODU               [CE55]
      R 128.83.rrr.rrr                     UTAUSTIN          [TLL8]
      R 128.84.rrr.rrr                     CORNELL-NET       [DK2]