Network Working Group                                        J. Reynolds
Request for Comments: 870                                      J. Postel
Obsoletes RFCs:  820,                                       October 1983
790, 776, 770, 762, 758, 755,
750, 739, 604, 503, 433, 349
Obsoletes IENs:  127, 117, 93
Page 1


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 Joyce Reynolds. The assignment
of numbers is also handled by Joyce. If you are developing a protocol
or application that will require the use of a link, socket, port,
protocol, or network number please contact Joyce to receive a number

Joyce Reynolds
USC - Information Sciences Institute
4676 Admiralty Way
Marina del Rey, California 90292

phone: (213) 822-1511


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
"Internet Protocol Transition Workbook" [16] or in the old "ARPANET
Protocol Handbook" [17] prepared by the NIC. Some of the items listed
are undocumented. Further information on protocols can be found in the
memo "Official Protocols" [52].

In all cases the name and mailbox of the responsible individual is
indicated. In the lists that follow, a bracketed entry, e.g., [16,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.

Page 2

Network Numbers


The network numbers listed here are used as internet addresses by the Internet Protocol (IP) [16,47]. The IP uses a 32-bit address field 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 of address, or class A, has a 7-bit network number and a 24-bit local address. The highest-order bit is set to 0. 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 of address, class B, has a 14-bit network number and a 16-bit local address. The two highest-order bits are set to 1-0. 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 of address, class C, has a 21-bit network number and a 8-bit local address. The three highest-order bits are set to 1-1-0. 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

Note: No addresses are allowed with the three highest-order bits set to 1-1-1. These addresses (sometimes called "class D") are reserved.

Page 3

Network Numbers

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 ISIF in dotted decimal is, or

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 three catagories of users of Internet Addresses: Research, 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 (in the column marked by an asterisk): R for Research and Development, D for DoD, and C for Commercial.

Numbers assigned for commercial use of IP family protocols, but not for interworking with the ARPA or DoD Internets are marked with an astrisk preceeding the number.

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

Page 4

Network Numbers

Assigned Network Numbers

Class A Networks

      * Internet Address  Name          Network               References
      - ----------------  ----          -------               ----------
        000.rrr.rrr.rrr                 Reserved                   [JBP]
      R 003.rrr.rrr.rrr T RCC-NET-TEMP  BBN RCC Network            [SGC]
      R 004.rrr.rrr.rrr   SATNET        Atlantic Satellite Network[DM11]
      D 005.rrr.rrr.rrr T DEMO-PR-1-TEMPDemo-1 Packet Radio Network[LCS]
      D 006.rrr.rrr.rrr T YPG-NET-TEMP  Yuma Proving Grounds     [2,BXA]
      D 007.rrr.rrr.rrr T EDN-TEMP      DCEC EDN                   [EC5]
      R 008.rrr.rrr.rrr T BBN-NET-TEMP  BBN Network               [JSG5]
      D 009.rrr.rrr.rrr T BRAGG-PR-TEMP Ft. Bragg Packet Radio Net [JEM]
      R 010.rrr.rrr.rrr   ARPANET       ARPANET              [2,17,REK2]
      C 012.rrr.rrr.rrr   ATT           ATT, Bell Labs            [MH12]
      C 014.rrr.rrr.rrr   PDN           Public Data Network       [REK2]
      R 018.rrr.rrr.rrr T MIT-TEMP      MIT Network         [11,51,DDC2]
      R 023.rrr.rrr.rrr   MITRE         MITRE Cablenet          [54,APS]
      D 024.rrr.rrr.rrr   MINET         MINET                    [2,DHH]
      R 025.rrr.rrr.rrr   RSRE-EXP      RSRE Experimental           [NM]
      D 026.rrr.rrr.rrr   MILNET        MILNET                     [HH6]
      R 027.rrr.rrr.rrr T NOSC-LCCN-TEMPNOSC / LCCN                [RH6]
      R 028.rrr.rrr.rrr   WIDEBAND      Wide Band Satellite Net   [CJW2]
      R 032.rrr.rrr.rrr   UCL-TAC       UCL TAC                     [PK]
      R 035.rrr.rrr.rrr T RSRE-NULL-TEMPRSRE Null Network           [NM]
      R 036.rrr.rrr.rrr T SU-NET-TEMP   Stanford University Network[JCM]
      R 039.rrr.rrr.rrr T SRINET-TEMP   SRI Local Network         [GEOF]
      R 041.rrr.rrr.rrr   BBN-TEST-A    BBN-GATE-TEST-A            [RH6]
      R 044.rrr.rrr.rrr   AMPRNET       Amateur Radio Experiment Net[HM]
      R 045.rrr.rrr.rrr T C3-PR-TEMP    Testbed Development PRNET  [BG5]
      R 046.rrr.rrr.rrr T Berkeley-TEMP Berkeley Ethernet         [DAM1]
      R 047.rrr.rrr.rrr T SAC-PR-TEMP   SAC Packet Radio Network   [BG5]
      R 048.rrr.rrr.rrr   NDRE-TIU      NDRE-TIU                   [PS3]
      R 050.rrr.rrr.rrr   NTA-RING      NDRE-RING                  [PS3]
        001.rrr.rrr.rrr-002.rrr.rrr.rrr Unassigned                 [JBP]
        011.rrr.rrr.rrr                 Unassigned                 [JBP]
        013.rrr.rrr.rrr                 Unassigned                 [JBP]
        015.rrr.rrr.rrr-017.rrr.rrr.rrr Unassigned                 [JBP]
        019.rrr.rrr.rrr-022.rrr.rrr.rrr Unassigned                 [JBP]
        029.rrr.rrr.rrr-031.rrr.rrr.rrr Unassigned                 [JBP]
        033.rrr.rrr.rrr-034.rrr.rrr.rrr Unassigned                 [JBP]
        037.rrr.rrr.rrr-038.rrr.rrr.rrr Unassigned                 [JBP]
        040.rrr.rrr.rrr                 Unassigned                 [JBP]
        042.rrr.rrr.rrr-043.rrr.rrr.rrr Unassigned                 [JBP]
        049.rrr.rrr.rrr                 Unassigned                 [JBP]
        051.rrr.rrr.rrr-126.rrr.rrr.rrr Unassigned                 [JBP]
        127.rrr.rrr.rrr                 Reserved                   [JBP]

Page 5

Network Numbers

Class B Networks

      * Internet Address  Name          Network               References
      - ----------------  ----          -------               ----------
        128.000.rrr.rrr                 Reserved                   [JBP]
      R 128.001.rrr.rrr   BBN-TEST-B    BBN-GATE-TEST-B            [RH6]
      R 128.002.rrr.rrr   CMU-NET       CMU-Ethernet              [HDW2]
      R 128.003.rrr.rrr   LBL-CSAM      LBL-CSAM-RESEARCH    [MO1]<--***
      R 128.004.rrr.rrr   DCNET         LINKABIT DCNET            [DLM1]
      R 128.005.rrr.rrr   FORDNET       FORD DCNET                [DLM1]
      R 128.006.rrr.rrr   RUTGERS       RUTGERS                   [CLH3]
      R 128.007.rrr.rrr   DFVLR         DFVLR DCNET Network       [HDC1]
      R 128.008.rrr.rrr   UMDNET        Univ of Maryland DCNET    [DLM1]
      R 128.009.rrr.rrr   ISI-NET       USC-ISI Local Network      [CMR]
      R 128.010.rrr.rrr   PURDUE-CS     Purdue Computer Science    [CAK]
      R 128.011.rrr.rrr   BBN-CRONUS    BBN DOS Project         [29,WIM]
      R 128.012.rrr.rrr   SU-NET        Stanford University Net    [JCM]
      D 128.013.rrr.rrr   MATNET        Mobile Access Terminal Net[DM11]
      R 128.014.rrr.rrr   BBN-SAT-TEST  BBN SATNET Test Net       [DM11]
      R 128.015.rrr.rrr   S1NET         LLL-S1-NET                [EAK1]
      R 128.016.rrr.rrr   UCLNET        University College London   [PK]
      D 128.017.rrr.rrr   MATNET-ALT    Mobile Access Terminal Alt[DM11]
      R 128.018.rrr.rrr   SRINET        SRI Local Network         [GEOF]
      D 128.019.rrr.rrr   EDN           DCEC EDN                   [EC5]
      D 128.020.rrr.rrr   BRLNET        BRLNET                  [2,MJM2]
      R 128.021.rrr.rrr   SF-PR-1       SF-1 Packet Radio Network  [JEM]
      R 128.022.rrr.rrr   SF-PR-2       SF-2 Packet Radio Network  [JEM]
      R 128.023.rrr.rrr   BBN-PR        BBN Packet Radio Network  [JAW3]
      R 128.024.rrr.rrr   ROCKWELL-PR   Rockwell Packet Radio Net  [EHP]
      D 128.025.rrr.rrr   BRAGG-PR      Ft. Bragg Packet Radio Net [JEM]
      D 128.026.rrr.rrr   SAC-PR        SAC Packet Radio Network   [BG5]
      D 128.027.rrr.rrr   DEMO-PR-1     Demo-1 Packet Radio Network[LCS]
      D 128.028.rrr.rrr   C3-PR         Testbed Development PR NET [BG5]
        128.029.rrr.rrr                 Unassigned                 [JBP]
      R 128.030.rrr.rrr   MIT-NET       MIT Local Network         [DDC2]
      R 128.031.rrr.rrr   MIT-RES       MIT Research Network      [DDC2]
      R 128.032.rrr.rrr   UCB-ETHER     UC Berkeley Ethernet      [DAM1]
      R 128.033.rrr.rrr   BBN-NET       BBN Network               [JSG5]
      R 128.034.rrr.rrr   NOSC-LCCN     NOSC / LCCN                [RH6]
      R 128.035.rrr.rrr   CISLTESTNET1  Honeywell            [25,26,RK1]
      R 128.036.rrr.rrr   YALE-NET      YALE NET                [61,JO5]
      D 128.037.rrr.rrr   YPG-NET       Yuma Proving Grounds     [2,BXA]
      D 128.038.rrr.rrr   NSWC-NET      NSWC Local Host Net       [RLH2]
        128.039.rrr.rrr-191.254.rrr.rrr Unassigned                 [JBP]
        191.255.rrr.rrr                 Reserved                   [JBP]

Page 6

Network Numbers

Class C Networks

      * Internet Address  Name          Network               References
      - ----------------  ----          -------               ----------
        192.000.000.rrr                 Reserved                   [JBP]
      R 192.000.001.rrr   BBN-TEST-C    BBN-GATE-TEST-C            [RH6]
        192.000.002.rrr-192.000.255.rrr Unassigned                 [JBP]
      R 192.001.000.rrr-192.004.255.rrr BBN local networks         [SGC]
      R 192.005.001.rrr   CISLHYPERNET  Honeywell                  [RK1]
      R 192.005.002.rrr   WISC          Univ of Wisconsin Madison [RS23]
      C 192.005.003.rrr   HP-DESIGN-AIDS HP Design Aids            [NXK]
      C 192.005.004.rrr   HP-TCG-UNIX   Hewlett Packard TCG Unix   [NXK]
        192.005.005.rrr                 Unassigned                 [JBP]
        192.005.006.rrr                 Unassigned                 [JBP]
      R 192.005.007.rrr   CIT-CS-NET    Caltech-CS-Net          [60,DSW]
      R 192.005.008.rrr   WASHINGTON    University of Washington  [JAR4]
      R 192.005.009.rrr   AERONET       Aerospace Labnet         [1,LCN]
      R 192.005.010.rrr   ECLNET        USC-ECL-CAMPUS-NET         [MXB]
      R 192.005.011.rrr   CSS-RING      SEISMIC-RESEARCH-NET       [RR2]
      R 192.005.012.rrr   UTAH-NET      UTAH-COMPUTER-SCIENCE-NET  [RF1]
      R 192.005.013.rrr   CCNET         Compion Network         [61,FAS]
      R 192.005.014.rrr   RAND-NET      RAND Network            [61,JDG]
      R 192.005.015.rrr   NYU-NET       NYU Network                [EF5]
      R 192.005.016.rrr   LANL-LAND     Los Alamos Dev LAN     [61,JC11]
      R 192.005.017.rrr   NRL-NET       Naval Research Lab          [AP]
      R 192.005.018.rrr   IPTO-NET      ARPA-IPTO Office Net      [REK2]
      R 192.005.019.rrr   UCIICS        UCI-ICS Res Net            [MXR]
      R 192.005.020.rrr   CISLTTYNET    Honeywell                  [RK1]
      D 192.005.021.rrr   BRLNET1       BRLNET1                 [2,MJM2]
      D 192.005.022.rrr   BRLNET2       BRLNET2                 [2,MJM2]
      D 192.005.023.rrr   BRLNET3       BRLNET3                 [2,MJM2]
      D 192.005.024.rrr   BRLNET4       BRLNET4                 [2,MJM2]
      D 192.005.025.rrr   BRLNET5       BRLNET5                 [2,MJM2]
      D 192.005.026.rrr   NSRDCOA-NET   NSRDC Office Auto Net      [TC4]
      D 192.005.027.rrr   DTNSRDC-NET   DTNSRDC-NET                [TC4]
      R 192.005.028.rrr   RSRE-NULL     RSRE-NULL                   [NM]
      R 192.005.029.rrr   RSRE-ACC      RSRE-ACC                    [NM]
      R 192.005.030.rrr   RSRE-PR       RSRE-PR                     [NM]
      R 192.005.031.rrr   SIEMENS-NET   Siemens Research Network   [PXN]
      R 192.005.032.rrr   CISLTESTNET2  Honeywell            [25,26,RK1]
      R 192.005.033.rrr   CISLTESTNET3  Honeywell            [25,26,RK1]
      R 192.005.034.rrr   CISLTESTNET4  Honeywell            [25,26,RK1]
      R 192.005.035.rrr   RIACS         USRA                   [61,RLB1]
      R 192.005.036.rrr   CORNELL-CS    CORNELL CS Research     [61,DK2]
      R 192.005.037.rrr   UR-CS-NET     U of R CS 3Mb Net       [31,LB1]
      R 192.005.038.rrr   SRI-C3ETHER   SRI-AITAD C3ETHERNET    [61,BG5]
      R 192.005.039.rrr   UDEL-EECIS    Udel EECIS LAN          [58,CC2]
      R 192.005.040.rrr   PUCC-NET-A    PURDUE Comp Cntr Net       [JXS]

Page 7

Network Numbers

      D 192.005.041.rrr   WISLAN        WIS Research LAN       [54,JRM1]
      D 192.005.042.rrr   AFDSC-HYPER   AFDSC Hypernet            [MCSJ]
      R 192.005.043.rrr   CUCSNET       Columbia CS Net         [61,LH2]
        192.005.044.rrr-192.005.255.rrr Unassigned                 [JBP]
      C*192.006.000.rrr-192.006.255.rrr Hewlett Packard            [AXG]
      C*192.007.000.rrr-192.007.255.rrr Computer Consoles, Inc.   [RA11]
      C*192.008.000.rrr-192.008.255.rrr Spartacus Computers, Inc.  [SXM]
        192.009.000.rrr-223.255.254.rrr Unassigned                 [JBP]
        223.255.255.rrr                 Reserved                   [JBP]

Other Reserved Internet Addresses

      * Internet Address  Name          Network               References
      - ----------------  ----          -------               ---------- Reserved                   [JBP]

Page 8

Network Numbers

Network Totals

Assigned for the Internet

         Class         A         B         C     Total

         Research     10        27      1055      1092

         Defense       2        10         9        21

         Commercial    2         0         2         4

         Total        14        37      1066      1117

Allocated for Internet and Other Uses

         Class         A         B         C     Total

         Research     10        27      1055      1092

         Defense       2        10         9        21

         Commercial    2         0       770       772

         Total        14        37      1834      1885

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

Page 9

Internet Version Numbers


In the Internet Protocol (IP) [16,47] 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                 [16,47,JBP]
          5      5         ST Datagram Mode                     [18,JWF]
       6-14   6-16         Unassigned                              [JBP]
         15     17         Reserved                                [JBP]


In the Internet Protocol (IP) [16,47] 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                            [16,40,JBP]
           2       2         Unassigned                            [JBP]
           3       3         Gateway-to-Gateway                  [24,MB]
           4       4         Unassigned                            [JBP]
           5       5         Stream (ST)                        [18,JWF]
           6       6         Transmission Control (TCP)      [16,48,JBP]
           7       7         UCL                                    [PK]
           8      10         Exterior Gateway Protocol (EGP)    [53,RH6]
           9      11         Unassigned                            [JBP]
          10      12         BBN RCC Monitoring                    [SGC]
          11      13         NVP                                [12,SC3]
          12      14         PUP                                [6,EAT3]
       13-14   15-16         Unassigned                            [JBP]
          15      17         Cross Net Debugger (XNET)         [23,JFH2]
          16      20         Chaos Stream                          [NC3]
          17      21         User Datagram (UDP)             [16,46,JBP]
          18      22         Multiplexing                       [13,JBP]
          19      23         DCN Measurement Subsystems           [DLM1]
          20      24         Host Monitoring (HMP)              [28,RH6]
          21      25         Packet Radio Measurement              [ZSU]

Page 10

Internet Protocol Numbers

          22      26         XEROX NS IDP                       [62,LLG]
          23      27         Trunk-1                               [BML]
          24      30         Trunk-2                               [BML]
          25      31         Leaf-1                                [BML]
          26      32         Leaf-2                                [BML]
       27-60   33-74         Unassigned                            [JBP]
          61      75         any host internal protocol            [JBP]
          62      76         CFTP                              [19,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]

Page 11

Port Numbers


Ports are used in the TCP [16,48] 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 [16,46].

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
      -------   -----     -----------                         ----------
      0         0         Reserved                                 [JBP]
      1-4       1-4       Unassigned                               [JBP]
      5         5         Remote Job Entry                    [8,17,JBP]
      7         7         Echo                                  [38,JBP]
      9         11        Discard                               [37,JBP]
      11        13        Active Users                          [34,JBP]
      13        15        Daytime                               [36,JBP]
      15        17        Who is up or NETSTAT                     [JBP]
      17        21        Quote of the Day                      [43,JBP]
      19        23        Character Generator                   [35,JBP]
      20        24        File Transfer (Default Data)       [16,39,JBP]
      21        25        File Transfer (Control)            [16,39,JBP]
      23        27        Telnet                                [50,JBP]
      25        31        SMTP                               [16,45,JBP]
      27        33        NSW User System FE                    [14,RHT]
      29        35        MSG ICP                               [32,RHT]
      31        37        MSG Authentication                    [32,RHT]
      33        41        Unassigned                               [JBP]
      35        43        Any Printer Server                       [JBP]
      37        45        Time                                  [49,JBP]
      39        47        Unassigned                               [JBP]
      41        51        Graphics                           [17,57,JBP]
      42        52        Host Name Server                   [16,42,JBP]
      43        53        NICNAME (WhoIs)                   [16,22,JAKE]
      44        54        MPM FLAGS Protocol                       [JBP]
      45        55        Message Processing Module (receive)   [41,JBP]
      46        56        MPM (default send)                    [41,JBP]
      47        57        NI FTP                                 [59,SK]

Page 12

Port Numbers

      49        61        Login Host Protocol                      [PXD]
      51        63        IMP Logical Address Maintenance       [30,AGM]
      53        65        Domain Name Server                       [PM1]
      55        67        ISI Graphics Language                  [5,RB6]
      57        71        Any Private Terminal Access              [JBP]
      59        73        Any Private File Service                 [JBP]
      61        75        NIMAIL                                  [3,SK]
      63        77        Unassigned                               [JBP]
      65        101       Unassigned                               [JBP]
      67        103       Datacomputer at CCA                   [10,JZS]
      69        105       Trivial File Transfer              [16,55,KRS]
      71        107       NETRJS                              [7,17,RTB]
      72        110       NETRJS                              [7,17,RTB]
      73        111       NETRJS                              [7,17,RTB]
      74        112       NETRJS                              [7,17,RTB]
      75        113       Any Private Dial Out Service             [JBP]
      77        115       Any Private RJE Service                  [JBP]
      79        117       Finger (Name)                      [17,20,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                   [10,JZS]
      99        143       Metagram Relay                          [GEOF]
      101       145       NIC Host Name Server              [16,21,JAKE]
      103       147       Unassigned                               [JBP]
      105       151       CSNET Mailbox Name Server (Program)  [56,MHS1]
      107       153       Remote Telnet Service                 [44,JBP]
      109-129   155-201   Unassigned                               [JBP]
      131       203       Datacomputer                          [10,JZS]
      132-223   204-337   Reserved                                 [JBP]
      224-241   340-361   Unassigned                               [JBP]
      243       363       Survey Measurement                      [4,AV]
      245       365       LINK                                  [9,RDB2]
      247-255   367-377   Unassigned                               [JBP]

Page 13

Autonomous System Numbers


The Exterior Gateway Protocol (EGP) [53] 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   Description                                   References
      -------   -----------                                   ----------
            0   Reserved                                           [JBP]
            1   The BBN Gateways                                    [MB]
            2   The DCN Gateways                                  [DLM1]
            3   The MIT Gateways                                   [LM8]
      4-65534   Unassigned                                         [JBP]
        65535   Reserved                                           [JBP]

Page 14

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 low order 4 bits of the message-id field are to be zero unless explicitly specified otherwise for the particular protocol used on that link. The Host/IMP interface is defined in BBN Report 1822 [2].

Link Assignments:

      Decimal   Octal     Description                         References
      -------   -----     -----------                         ----------
      0         0         Reserved                                 [JBP]
      1-149     1-225     Unassigned                               [JBP]
      150       226       Xerox NS IP                           [62,LLG]
      151       227       Unassigned                               [JBP]
      152       230       PARC Universal Protocol               [6,EAT3]
      153       231       TIP Status Reporting                     [JGH]
      154       232       TIP Accounting                           [JGH]
      155       233       Internet Protocol (regular)        [16,47,JBP]
      156-158   234-236   Internet Protocol (experimental)   [16,47,JBP]
      159-195   237-303   Unassigned                               [JBP]
      196-255   304-377   Experimental Protocols                   [JBP]
      248-255   370-377   Network Maintenance                      [JGH]


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.


      Ethernet          Exp. Ethernet    Description          References
      --------------    --------------   -----------          ----------
      decimal    Hex    decimal  octal
         512   02,00        512   1000   XEROX PUP              [6,EAT3]
        1536   06,00       1536   3000   XEROX NS IDP           [62,LLG]
        2048   08,00        513   1001   DOD IP              [16,47,JBP]
        2054   08,06        -      -     Address Res           [33,DCP1]

Page 15

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).


      Internet           Public Data Net    Description       References
      ---------------   -----------------   -----------       ----------                       Reserved               [JBP]   3110-317-00035 00   PURDUE-TN              [CAK]   3110-608-00027 00   UWISC-TN               [CAK]   3110-302-00024 00   UDEL-TN                [CAK]   2342-192-00149 23   UCL-VTEST               [PK]   2342-192-00300 23   UCL-TG                  [PK]   2342-192-00300 25   UK-SATNET               [PK]   3110-608-00024 00   UWISC-IBM             [MHS1]   3110-213-00045 00   RAND-TN                [MO2]   2342-192-00300 23   UCL-CS                  [PK]   3110-617-00025 00   BBN-VAN-GW            [JD21]       Unassigned             [JBP]                       Reserved               [JBP]

The standard for transmission of IP datagrams over the Public Data Network is specified in [27].

Page 16




   [1]    Aerospace, Internal Report, ATM-83(3920-01)-3, 1982.

   [2]    BBN, "Specifications for the Interconnection of a Host and an
          IMP", Report 1822, Bolt Beranek and Newman, Cambridge,
          Massachusetts, revised, December 1981.

   [3]    Bennett, C., "A Simple NIFTP-Based Mail System", IEN 169,
          University College, London, January 1981.

   [4]    Bhushan, A., "A Report on the Survey Project", RFC 530,
          NIC 17375, 22 June 1973.

   [5]    Bisbey, R., D. Hollingworth, and B. Britt, "Graphics Language
          (version 2.1)", ISI/TM-80-18, USC/Information Sciences
          Institute, July 1980.

   [6]    Boggs, D., J. Shoch, E. Taft, and R. Metcalfe, "PUP: An
          Internetwork Architecture", XEROX Palo Alto Research Center,
          CSL-79-10, July 1979; also in IEEE Transactions on
          Communication, Volume COM-28, Number 4, April 1980.

   [7]    Braden, R., "NETRJS Protocol", RFC 740, NIC 42423,
          22 November 1977.  Also in [17].

   [8]    Bressler, B., "Remote Job Entry Protocol",  RFC 407, NIC
          12112, 16 October 72.  Also in [17].

   [9]    Bressler, R., "Inter-Entity Communication -- An Experiment",
          RFC 441, NIC 13773, 19 January 1973.

   [10]   CCA, "Datacomputer Version 5/4 User Manual", Computer
          Corporation of America, August 1979.

   [11]   Clark, D., "Revision of DSP Specification", Local Network
          Note 9, Laboratory for Computer Science, MIT, 17 June 1977.

   [12]   Cohen, D., "Specifications for the Network Voice Protocol",
          RFC 741, ISI/RR 7539, USC/Information Sciences Institute,
          March 1976.

   [13]   Cohen, D. and J. Postel, "Multiplexing Protocol", IEN 90,
          USC/Information Sciences Institute, May 1979.

Page 17


   [14]   COMPASS, "Semi-Annual Technical Report", CADD-7603-0411,
          Massachusetts Computer Associates, 4 March 1976. Also as,
          "National Software Works, Status Report No. 1,"
          RADC-TR-76-276, Volume 1, September 1976. And COMPASS. "Second
          Semi-Annual Report," CADD-7608-1611, Massachusetts Computer
          Associates, 16 August 1976.

   [15]   Crispin, M., "SUPDUP Protocol", RFC 734, NIC 41953,
          7 October 1977.  Also in [17].

   [16]   Feinler, E., "Internet Protocol Transition Workbook", Network
          Information Center, SRI International, March 1982.

   [17]   Feinler, E. and J. Postel, eds., "ARPANET Protocol Handbook",
          NIC 7104, for the Defense Communications Agency by SRI
          International, Menlo Park, California, Revised January 1978.

   [18]   Forgie, J., "ST - A Proposed Internet Stream Protocol",
          IEN 119, M.I.T. Lincoln Laboratory, September 1979.

   [19]   Forsdick, H., "CFTP", Network Message, Bolt Berenak and
          Newman, January 1982.

   [20]   Harrenstien, K., "Name/Finger", RFC 742, NIC 42758,
          30 December 1977.  Also in [17].

   [21]   Harrenstien, K., V. White, and E. Feinler, "Hostnames Server",
          RFC 811, SRI International, March 1982.

   [22]   Harrenstien, K., and V. White, "Nicname/Whois", RFC 812, SRI
          International, March 1982.

   [23]   Haverty, J., "XNET Formats for Internet Protocol Version 4",
          IEN 158, October 1980.

   [24]   Hinden, R., A. Sheltzer, "The DARPA Internet Gateway",
          RFC 823, September 1982.

   [25]   Honeywell CISL, Internal Document, "AFSDSC Hyperchannel RPQ
          Project Plan".

   [26]   Honeywell CISL, Internal Document, "Multics MR11 PFS".

   [27]   Korb, John T., "A Standard for the Transmission of IP
          Datagrams Over Public Data Networks", RFC 877, Purdue
          University, September 1983.

Page 18


   [28]   Littauer, B., "A Host Monitoring Protocol", IEN 197, Bolt
          Berenak and Newman, September 1981.

   [29]   Macgregor, W., and D. Tappan, "The CRONUS Virtual Local
          Network", RFC 824, Bolt Beranek and Newman, 22 August 1982.

   [30]   Malis, A., "Logical Addressing Implementation Specification",
          BBN Report 5256, pp 31-36, May 1983.

   [31]   Metcalfe, R.M. and D.R. Boggs, "Ethernet: Distributed Packet
          Switching for Local Computer Networks", Communications of the
          ACM, 19 (7), pp 395-402, July 1976.

   [32]   NSW Protocol Committee, "MSG: The Interprocess Communication
          Facility for the National Software Works", CADD-7612-2411,
          Massachusetts Computer Associates, BBN 3237, Bolt Beranek and
          Newman, Revised 24 December 1976.

   [33]   Plummer, D., "An Ethernet Address Resolution Protocol or
          Converting Network Protocol Addresses to 48-bit Ethernet
          Addresses for Transmission on Ethernet Hardware", RFC 826, MIT
          LCS, November 1982.

   [34]   Postel, J., "Active Users", RFC 866, USC/Information Sciences
          Institute, May 1983.

   [35]   Postel, J., "Character Generator Protocol", RFC 864,
          USC/Information Sciences Institute, May 1983.

   [36]   Postel, J., "Daytime Protocol", RFC 867, USC/Information
          Sciences Institute, May 1983.

   [37]   Postel, J., "Discard Protocol", RFC 863, USC/Information
          Sciences Institute, May 1983.

   [38]   Postel, J., "Echo Protocol", RFC 862, USC/Information Sciences
          Institute, May 1983.

   [39]   Postel, J., "File Transfer Protocol", RFC 765, IEN 149,
          USC/Information Sciences Institute, June 1980.

   [40]   Postel, J., "Internet Control Message Protocol - DARPA
          Internet Program Protocol Specification", RFC 792,
          USC/Information Sciences Institute, September 1981.

   [41]   Postel, J., "Internet Message Protocol", RFC 759, IEN 113,
          USC/Information Sciences Institute, August 1980.

Page 19


   [42]   Postel, J., "Name Server", IEN 116, USC/Information Sciences
          Institute, August 1979.

   [43]   Postel, J., "Quote of the Day Protocol", RFC 865,
          USC/Information Sciences Institute, May 1983.

   [44]   Postel, J., "Remote Telnet Service", RFC 818, USC/Information
          Sciences Institute, November 1982.

   [45]   Postel, J., "Simple Mail Transfer Protocol", RFC 821,
          USC/Information Sciences Institute, August 1982.

   [46]   Postel, J., "User Datagram Protocol", RFC 768 USC/Information
          Sciences Institute, August 1980.

   [47]   Postel, J., ed., "Internet Protocol - DARPA Internet Program
          Protocol Specification", RFC 791, USC/Information Sciences
          Institute, September 1981.

   [48]   Postel, J., ed., "Transmission Control Protocol - DARPA
          Internet Program Protocol Specification", RFC 793,
          USC/Information Sciences Institute, September 1981.

   [49]   Postel, J., and K. Harrenstien, "Time Protocol", RFC 868,
          USC/Information Sciences Institute, May 1983.

   [50]   Postel, J., and J. Reynolds, "Telnet Protocol Specification",
          RFC 854, USC/Information Sciences Institute, May 1983.

   [51]   Reed, D., "Protocols for the LCS Network", Local Network Note
          3, Laboratory for Computer Science, MIT, 29 November 1976.

   [52]   Reynolds, J. and J. Postel, "Official Protocols", RFC 880,
          USC/Information Sciences Institute, October 1983.

   [53]   Rosen, E., "Exterior Gateway Protocol" RFC 827, Bolt Berenak
          and Newman, October 1982.

   [54]   Skelton, A., S. Holmgren, and D. Wood, "The MITRE Cablenet
          Project", IEN 96, April 1979.

   [55]   Sollins, K., "The TFTP Protocol (Revision 2)", RFC 783,
          MIT/LCS, June 1981.

   [56]   Solomon, M., L. Landweber, and D, Neuhengen, "The CSNET Name
          Server", Computer Networks, v.6, n.3, pp. 161-172, July 1982.

Page 20


   [57]   Sproull, R., and E. Thomas, "A Networks Graphics Protocol",
          NIC 24308, 16 August 1974.  Also in [17].

   [58]   "The Ethernet - A Local Area Network", Version 1.0, Digital
          Equipment Corporation, Intel Corporation, Xerox Corporation,
          September 1980.

   [59]   The High Level Protocol Group, "A Network Independent File
          Transfer Protocol",  INWG Protocol Note 86, December 1977.

   [60]   Whelan, D., "The Caltech Computer Science Department Network",
          5052:DF:82, Caltech Computer Science Department, 1982.

   [61]   XEROX, "The Ethernet, A Local Area Network: Data Link Layer
          and Physical Layer Specification", X3T51/80-50, Xerox
          Corporation, Stamford, CT., October 1980.

   [62]   XEROX, "Internet Transport Protocols",  XSIS 028112, Xerox
          Corporation, Stamford, Connecticut, December 1981.

Page 21



   [AGM]     Andy Malis          BBN       Malis@BBN-UNIX
   [APS]     Anita Skelton       MITRE     skelton@MITRE
   [AP]      Alan Parker         NRL       parker@NRL-CSS
   [AV]      Al Vezza            MIT       AV@MIT-XX
   [AXG]     Atul Garg           HP        ---none---
   [BG5]     Bob Gilligan        SRI       Gilligan@SRI-KL
   [BML]     Barry Leiner        ARPA      Leiner@USC-ISIA
   [BXA]     Bobby W. Allen      YPG       WYMER@OFFICE
   [CAK]     Chris Kent          PURDUE    cak@PURDUE
   [CC2]     Chase Cotton        UDEL      Cotton@Udel-EE
   [CJW2]    Cliff Weinstein     LL        cjw@LL-11
   [CLH3]    Charles Hedrick     RUTGERS   Hedrick@RUTGERS
   [CMR]     Craig Rogers        ISI       Rogers@USC-ISIB
   [DAM1]    David A. Mosher     UCB       Mosher@BERKELEY
   [DCP1]    David Plummer       MIT       DCP@MIT-MC
   [DCT]     Dan Tappan          BBN       Tappan@BBNG
   [DDC2]    Dave Clark          MIT-LCS   Clark@MIT-Multics
   [DHH]     Doug Hunt           BBN       DHunt@BBN-Unix
   [DK2]     Dean B. Krafft      CORNELL   Dean@CORNELL
   [DLM1]    David Mills         LINKABIT  Mills@USC-ISID
   [DM11]    Dale McNeill        BBN       mcneill@BBN-Unix
   [DPR]     David Reed          MIT-LCS   DPR@MIT-XX
   [DSW]     Dan Whelan          Caltech   Dan@CIT-20
   [EAK1]    Earl Killian        LLL       EAK@MIT-MC
   [EAT3]    Ed Taft             XEROX     Taft.PA@PARC-MAXC
   [EBM]     Eliot Moss          MIT       EBM@MIT-XX
   [EC5]     Ed Cain             DCEC      cain@EDN-Unix
   [EF5]     Ed Franceschini     NYU       Franceschini@NYU
   [EHP]     Ed Perry            SRI       Perry@SRI-KL
   [FAS]     Fred Segovich       Compion   fred@COMPION-VMS
   [GEOF]    Geoff Goodfellow    SRI       Geoff@DARCOM-KA
   [HCF2]    Harry Forsdick      BBN       Forsdick@BBNG
   [HDC1]    Horst Clausen       DFVLR     Clausen@USC-ISID
   [HDW2]    Howard Wactlar      CMU       Wactlar@CMU-10B
   [HH6]     Heidi Heiden        DCA       Heiden@BBNC
   [HM]      Hank Magnuski       ---       JOSE@PARC-MAXC
   [JAKE]    Jake Feinler        SRI       Feinler@SRI-KL
   [JAR4]    Jim Rees            WASHINGTON JIM@WASHINGTON
   [JAW3]    Jil Westcott        BBN       Westcott@BBNF
   [JBP]     Jon Postel          ISI       Postel@USC-ISIF
   [JC11]    Jim Clifford        LANL      jrc@LANL
   [JCM]     Jeff Mogul          STANFORD  Mogul@SU-SCORE
   [JD21]    Jonathan Dreyer     BBN       JDreyer@BBN-Unix
   [JDG]     Jim Guyton          RAND      guyton@RAND-Unix
   [JEM]     Jim Mathis          SRI       Mathis@SRI-KL
   [JFH2]    Jack Haverty        BBN       Haverty@BBN-Unix

Page 22


   [JGH]     Jim Herman          BBN       Herman@BBN-Unix
   [JO5]     John O'Donnell      YALE      ODonnell@YALE
   [JRM1]    John Mullen         MITRE     Mullen@MITRE
   [JSG5]    Jon Goodridge       BBN       jsg@BBN-UNIX
   [JWF]     Jim Forgie          LL        Forgie@BBNC
   [JXS]     Jeffrey R. Schwab   PURDUE    jrs@PURDUE
   [JZS]     Joanne Sattely      CCA       JZS@CCA
   [KLH]     Ken Harrenstien     SRI       KLH@NIC
   [KRS]     Karen Sollins       MIT       Sollins@MIT-XX
   [LB1]     Liudvikas Bukys     ROCHESTER Bukys@ROCHESTER
   [LCN]     Lou Nelson          AEROSPACE Lou@AEROSPACE
   [LCS]     Lou Schreier        SRI       Schreier@USC-ISID
   [LH2]     Lincoln Hu          COLUMBIA  Hu@Columbia-20
   [LLG]     Larry Garlick       XEROX     Garlick@PARC-MAXC
   [LM8]     Liza Martin         MIT-LCS   Martin@MIT-XX
   [MBG]     Michael Greenwald   MIT-LCS   Greenwald@MIT-Multics
   [MB]      Michael Brescia     BBN       Brescia@BBN-Unix
   [MCSJ]    Mike StJohns        AFDSC     StJohns@MIT-MULTICS
   [MH12]    Mark Horton         ATT       mark@BERKELEY
   [MHS1]    Marvin Solomon      WISC      Solomon@UWISC
   [MJM2]    Mike Muuss          BRL       Mike@BRL
   [MO2]     Michael O'Brien     RAND      OBrien@RAND-Unix
   [MRC]     Mark Crispin        Stanford  Admin.MRC@SU-SCORE
   [MXB]     Mark Brown          USC       Mark@USC-ECLB
   [MXR]     Marshall Rose       Irvine    MRose.UCI@RAND-Relay
   [NC3]     J. Noel Chiappa     MIT       JNC@MIT-XX
   [NM]      Neil MacKenzie      RSRE      T45@USC-ISID
   [NXK]     Neil Katin          HP        hpda.neil@BERKELEY
   [PK]      Peter Kirstein      UCL       Kirstein@USC-ISIA
   [PM1]     Paul Mockapetris    ISI       Mockapetris@USC-ISIF
   [PS3]     Paal Spilling       NDRE      Paal@DARCOM-KA
   [PXD]     Pieter Ditmars      BBN       pditmars@BBN-UNIX
   [PXN]     Peter Nellessen     SIEMENS   crtvax!pn@CMU-CS-SPICE
   [RA11]    Rick Adams          CCI       rlgvax!ra@SEISMO
   [RB6]     Richard Bisbey      ISI       Bisbey@USC-ISIB
   [RDB2]    Robert Bressler     BBN       Bressler@BBN-Unix
   [REK2]    Robert Kahn         ARPA      Kahn@USC-ISIA
   [RF1]     Randy Frank         UTAH      Frank@UTAH-20
   [RH6]     Robert Hinden       BBN       Hinden@BBN-Unix
   [RHT]     Robert Thomas       BBN       BThomas@BBNG
   [RK1]     Richard Kovalcik    Honeywell Kovalcik@MIT-MULTICS
   [RLB1]    Bob Brown           USRA      rlb@ames-vmsb
   [RLH2]    Ronald L. Hartung   NSWC      ron@nswc-wo
   [RR2]     Raleigh Romine      Teledyne  romine@SEISMO
   [RS23]    Russel Sandberg     WISC      root@UWISC
   [RTB]     Bob Braden          UCLA      Braden@USC-ISIA
   [SC3]     Steve Casner        ISI       Casner@USC-ISIB
   [SGC]     Steve Chipman       BBN       Chipman@BBNA

Page 23


   [SK]      Steve Kille         UCL       UKSAT@USC-ISID
   [SXM]     Scott Marcus        Spartacus ---none---
   [TC4]     Tony Cincotta       DTNSRDC   tony@NALCON
   [WIM]     William Macgregor   BBN       macg@BBN
   [ZSU]     Zaw-Sing Su         SRI       ZSu@SRI-TSC

Page 24




This appendix summarizes the agreements reached by the DDN/PMO and DARPA at a September 1982 meeting concerning the allocation and assignment of the various numbers associated with DoD Protocol Standards and the DARPA Experimental Standards.

Recommended policy is summarized for each type of number assignment of concern:

Network Identifiers used by the Internet Protocol

It is recommended that the available number spaces for class A, B, and C network addresses be allocated among R&D, DoD and commercial uses, and that assignments of these addresses be the responsibility respectively of DARPA, DCA PCCO/DDN and the National Bureau of Standards. The recommended allocations are given below.

Class A (highest-order bit 0)

            R&D allocation:          8 nets
            DoD allocation:         24 nets
            Commercial allocation:  94 nets
            Reserved Addresses:  0,127

Class B (highest-order bits 1-0)

            R&D allocation:          1024 nets
            DoD allocation:          3072 nets
            Commercial allocation:  12286 nets
            Reserved Addresses:  0,16383

Class C (highest-order bits 1-1-0)

            R&D allocation:           65536 nets
            DoD allocation:          458725 nets
            Commercial allocation:  1572862 nets
            Reserved Addresses:  0,2097151

Class D (highest-order bits 1-1-1)

All addresses in this class are reserved for future use, possibly in support of multicast services. They should be allocated to R&D use for the present.

Page 25


Within the R&D community, it will be the policy that network identifiers will only be granted to applicants who show evidence that they are acquiring standard Bolt Beranek and Newman gateway software or have implemented or are acquiring a gateway meeting the Exterior Gateway Protocol requirements. Acquisition of the Berkeley BSD 4.2 UNIX software might be considered evidence of the latter.

Experimental networks which later become operational need not be renumbered. Rather, the identifiers could be moved from R&D to DoD or Commercial status. Thus, network identifiers may change state among R&D, DoD and commercial, but the number of identifiers allocated to each use should remain within the limits indicated above. To make possible this fluid assignment, it is recommended that the network identifier spaces not be allocated by simple partition but rather by specific assignment.

Protocol Identifiers

In general, all assignments will be made by the R&D community, but any numbers which become R&D, DoD, national or
international standards will be marked as such in this RFC.

Protocol identifiers 0 and 255 are reserved.

95 protocol identifiers are allocated for assignment to DoD standards, 32 for R&D use, and 127 for Commercial, national or international standards.

Port Numbers

A recommendation for allocation and assignment of port numbers is to be developed jointly by representatives of the ICCB and PSTP.

ARPANET Link Numbers

All unnecessary link number usage will be eliminated by joint effort of the ICCB, PSTP and BBN.

BBN will give consideration to the use of link numbers to promote interoperability among various ARPANET interfaces and report to the ICCB, PSTP and DDN/PMO. Examples of possible interoperability issues are:

            (i)   interoperability of 1822 and X.25 interfaces
            (ii)  interoperability of SIP and other interfaces
            (iii) logical addressing or other special services

Page 26


IP Version Numbers

These numbers will be assigned only by the R&D community for the purpose of exploring alternatives in internet protocol service expansion, such as inclusion of stream protocol (ST) services.

TCP, IP and Telnet Option Identifiers

These numbers will be assigned by the R&D community. Any permanent or experimental assignments will be identified in the documents specifying those protcols.


This policy recommendation has not been fully implemented as yet. Currently, Joyce Reynolds is acting coordinator for all number assignments.