This memo is an official status report on the numbers used in protocols in the ARPA-Internet community. Distribution of this memo is unlimited.
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, network number, etc., please contact Joyce to receive a number assignment.
Joyce Reynolds USC - Information Sciences Institute 4676 Admiralty Way Marina del Rey, California 90292-6695
Phone: (213) 822-1511
ARPA mail: JKREYNOLDS@USC-ISIF.ARPA
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"  or in the old "ARPANET Protocol Handbook"  prepared by the NIC. Some of the items listed are undocumented. Further information on protocols can be found in the memo "Official ARPA-Internet Protocols" .
In all cases the name and mailbox of the responsible individual is indicated. In the lists that follow, a bracketed entry, e.g., [nn,iii], at the right hand margin of the page indicates a reference for the listed protocol, where the number ("nn") cites the document and the letters ("iii") cites the person. Whenever possible, letters are a NIC Ident as used in the WHOIS service.
The network numbers listed here are used as internet addresses by the Internet Protocol (IP) [33,77]. 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.
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 USC-ISIF.ARPA in dotted decimal is 010.002.000.052, or 10.2.0.52.
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 ARPA-Internet and DDN-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 either the ARPA-Internet of the DDN-Internet. Independent networks need not be listed in the working tables of either the ARPA-Internet or DDN-Internet hosts or gateways.
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".
In certain contexts, it is useful to have fixed addresses with functional significance rather than as identifiers of specific hosts. When such usage is called for, the address zero is to be interpreted as meaning "this", as in "this network". The address of all ones are to be interpreted as meaning "all", as in "all hosts". For example, the address 220.127.116.11 could be
interpreted as meaning all hosts on the network 128.9. Or, the address 0.0.0.37 could be interpreted as meaning host 37 on this network.
Assigned Network Numbers
Class A Networks
* Internet Address Name Network References - ---------------- ---- ------- ---------- 000.rrr.rrr.rrr Reserved [JBP] R 004.rrr.rrr.rrr SATNET Atlantic Satellite Network[DM11] D 006.rrr.rrr.rrr T YPG-NET-TEMP Yuma Proving Grounds [7,BXA] D 007.rrr.rrr.rrr T EDN-TEMP DCEC EDN [EC5] R 008.rrr.rrr.rrr T BBN-NET-TEMP BBN Network [JSG5] R 010.rrr.rrr.rrr ARPANET ARPANET [7,34,REK2] D 011.rrr.rrr.rrr DODIIS DoD INTEL INFO SYS [AY7] C 012.rrr.rrr.rrr ATT ATT, Bell Labs [MH13] C 014.rrr.rrr.rrr PDN Public Data Network [REK4] R 018.rrr.rrr.rrr T MIT-TEMP MIT Network [15,88,DDC2] D 022.rrr.rrr.rrr DISNET DISNET [FLM2] D 023.rrr.rrr.rrr DDN-TC-NET DDN-TestCell-Network [DH17] D 024.rrr.rrr.rrr MINET MINET [7,DHH] D 026.rrr.rrr.rrr MILNET MILNET [FLM2] 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 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] 001.rrr.rrr.rrr-003.rrr.rrr.rrr Unassigned [JBP] 005.rrr.rrr.rrr Unassigned [JBP] 009.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-021.rrr.rrr.rrr Unassigned [JBP] 025.rrr.rrr.rrr Unassigned [JBP] 029.rrr.rrr.rrr-031.rrr.rrr.rrr Unassigned [JBP] 033.rrr.rrr.rrr-035.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] 045.rrr.rrr.rrr-126.rrr.rrr.rrr Unassigned [JBP] 127.rrr.rrr.rrr Reserved [JBP]
* 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 [JS38] R 128.004.rrr.rrr DCNET LINKABIT DCNET [59,DLM1] R 128.005.rrr.rrr FORDNET FORD DCNET [59,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 [59,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 [55,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 [7,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] R 128.029.rrr.rrr MITRE MITRE Cablenet [94,APS] 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 [46,47,RK1] R 128.036.rrr.rrr YALE-NET YALE NET [108,JO5] D 128.037.rrr.rrr YPG-NET Yuma Proving Grounds [7,BXA] D 128.038.rrr.rrr NSWC-NET NSWC Local Host Net [RLH2] R 128.039.rrr.rrr NTANET NDRE-TIU [PS3] R 128.040.rrr.rrr UCL-NET-A UCL [RC7] R 128.041.rrr.rrr UCL-NET-B UCL [RC7] R 128.042.rrr.rrr RICE-NET Rice University [59,108,PGM] R 128.043.rrr.rrr CRANET Canada REF ARPANET [7,JR17]
D 128.044.rrr.rrr WSMR-NET White Sands Network [TBS] C 128.045.rrr.rrr DEC-WRL-NET DEC WRL Network [108,RKJ2] 128.046.rrr.rrr Unassigned Unassigned [JBP] D 128.047.rrr.rrr TACTNET Tactical Packet Net [6,KTP] C*128.048.rrr.rrr UCDLA-NET UCDLA MELVYL Network [7,CXL] R 128.049.rrr.rrr NOSC-ETHER NOSC Ethernet [108,RLB3] G 128.050.rrr.rrr COINS Network COINS On-Line Intel Net [RLS6] G 128.051.rrr.rrr COINSTNET COINS TEST NETWORK [RLS6] R 128.052.rrr.rrr MIT-AI-NET MIT AI NET [108,MDC] R 128.053.rrr.rrr SAC-PR-2 SAC PRNET Number 2 [BG5] R 128.054.rrr.rrr UCSD UC San Diego Network [108,GH29] 128.055.rrr.rrr-128.063.rrr.rrr Unassigned [JBP] R 128.064.rrr.rrr-128.079.rrr.rrr Net Dynamics Exp [ZSU] 128.080.rrr.rrr-191.254.rrr.rrr Unassigned [JBP] 191.255.rrr.rrr Reserved [JBP]
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-192.003.255.rrr BBN local networks [SGC] R*192.004.000.rrr-192.004.255.rrr Bellcore-Net [108,PXK] 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] R 192.005.005.rrr DEC-MRNET DEC Marlboro Ethernet [101,KWP] R 192.005.006.rrr DEC-MRRAD DEC Marlboro Developmt [101,KWP] R 192.005.007.rrr CIT-CS-NET Caltech-CS-Net [107,DSW] R 192.005.008.rrr WASHINGTON University of Washington [JAR4] R 192.005.009.rrr AERONET Aerospace Labnet [2,LCN] R 192.005.010.rrr ECLNET USC-ECL-CAMPUS-NET [MAB4] 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 GSWDNET Compion Network [108,FAS] R 192.005.014.rrr RAND-NET RAND Network [108,JDG] R 192.005.015.rrr NYU-NET NYU Network [EF5] R 192.005.016.rrr LANL-LAND Los Alamos Dev LAN [108,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 [MTR] R 192.005.020.rrr CISLTTYNET Honeywell [RK1] D 192.005.021.rrr BRLNET1 BRLNET1 [7,MJM2] D 192.005.022.rrr BRLNET2 BRLNET2 [7,MJM2] D 192.005.023.rrr BRLNET3 BRLNET3 [7,MJM2]
D 192.005.024.rrr BRLNET4 BRLNET4 [7,MJM2] D 192.005.025.rrr BRLNET5 BRLNET5 [7,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 [46,47,RK1] R 192.005.033.rrr CISLTESTNET3 Honeywell [27,28,RK1] R 192.005.034.rrr CISLTESTNET4 Honeywell [27,28,RK1] R 192.005.035.rrr RIACS USRA [108,RLB1] R 192.005.036.rrr CORNELL-CS CORNELL CS Research [108,DK2] R 192.005.037.rrr UR-CS-NET U of R CS 3Mb Net [58,LB1] R 192.005.038.rrr SRI-C3ETHER SRI-AITAD C3ETHERNET [108,BG5] R 192.005.039.rrr UDEL-EECIS Udel EECIS LAN [102,CC2] R 192.005.040.rrr PUCC-NET-A PURDUE Comp Cntr Net [JRS8] D 192.005.041.rrr WISLAN WIS Research LAN [94,JRM1] D 192.005.042.rrr AFDSC-HYPER AFDSC Hypernet [MCSJ] R 192.005.043.rrr CUCSNET Columbia CS Net [108,LH2] R 192.005.044.rrr Farber-PC-Net Farber PC Network [DJF] R 192.005.045.rrr AIDS-NET AI&DS Network [108,HA] R 192.005.046.rrr NTA-RING NDRE-RING [PS3] R 192.005.047.rrr NSRDC NSRDC [PXM] R 192.005.048.rrr PURDUE-CS-IL Purdue CS IL Ethernet [108,CAK] R 192.005.049.rrr UCSF Univ of Calif, San Fran[102,TF6] R 192.005.050.rrr CTH-CS-NET Chalmers CSN Net [102,UXB] R 192.005.051.rrr Theorynet Cornell Theory Center [108,AB13] R 192.005.052.rrr NLM-ETHER NLM-LHNCBC-ETHERNET [77,JA1] R 192.005.053.rrr UR-CS-ETHER U of R CS 10Mb Net [58,LB1] R 192.005.054.rrr AERO-A6 Aerospace [2,LCN] R*192.005.055.rrr UCLA-CECS UCLA-CECS Network [108,RBW] C 192.005.056.rrr TARTAN-NET Tartan Labs [SXB] R 192.005.057.rrr UDEL-CC UDEL Comp Center [102,RR18] R 192.005.058.rrr CSNET-PDN CSNET X.25 Network [52,RDR4] R*192.005.059.rrr Inria SM90 Inria GIP SM-90 [MXS] R*192.005.060.rrr SM90 X1 Inria SM-90 exp. 1 [MXS] R*192.005.061.rrr SM90 X2 Inria SM-90 exp. 2 [MXS] R*192.005.062.rrr LITP SM90 LITP SM-90 [MXS] R 192.005.064.rrr AMES-NAS-NET NASA ARC NAS LAN [101,MF31] R 192.005.065.rrr NPRDC-Ether NPRDC TRCF Ethernet [LRB] R 192.005.066.rrr HARV-NET Harvard Comp Sci Net [SXB1] R 192.005.067.rrr CECOM-ETHER CECOM ADDCOMPE ETHER [102,GIH] R 192.005.068.rrr AERO-130 AEROSPACE-130 [LCN] R 192.005.069.rrr UIUC-NET Univ of IL at Urbana [108,AXC] G 192.005.070.rrr CELAN COINS Exper. LAN [MXM] R 192.005.071.rrr SAC-ETHER SAC C3 Ethernet [108,BG5] R*192.005.072.rrr-192.005.087.rrr U Chicago [TXN]
R 192.005.088.rrr YALE-EE-NET YALE-EE-NET [108,AG22] R 192.005.089.rrr UTEXAS-NET U. Texas Austin Net [108,JSQ1] R 192.005.090.rrr HARV-ETHER Harvard CS Ethernet [SXB1] R 192.005.091.rrr PURDUE-ECN1 Purdue ECN [30,49,GG11] R 192.005.092.rrr BRAGG-ETHER SRI Bragg Ether [103,GIH] R 192.005.093.rrr SRI-DEMO SRI Ether Demo [103,GIH] R*192.005.094.rrr SDCRDCF-10MB SDC R&D primary net [108,DJV1] R*192.005.095.rrr SDCRDCF-3MB SDC R&D old net [58,DJV1] R*192.005.096.rrr UBC-CS-NET UBC Comp Sci Net [108,PXB] R*192.005.097.rrr UCLA-CS-LNI UCLA CS LNI Network [RBW] R*192.005.098.rrr UCLA-PIC UCLA PIC Network [108,RBW] R 192.005.099.rrr SPACENET S-1 Workstation Network[108,TXW] R 192.005.100.rrr PURDUE-ECN2 Purdue ECN [30,49,GG11] R 192.005.101.rrr PUCC-GW-NET Purdue Gateway Network [JRS8] R 192.005.102.rrr PUCC-RHF-NET PUCC RHF Based Net [JRS8] C*192.005.103.rrr TYM-NTD-NET Tymnet NTD Ethernet [SMF] R 192.005.104.rrr TMC-INET Thinking Machines [108,BJN1] R 192.005.105.rrr CCA-POND CCA Ethernet1 (POND) [108,AL6] C*192.005.106.rrr BITSTREAM Bitstream Type Foundry [108,PXA] R*192.005.107.rrr PASC-ETHER IBM PASC Ethernet [108,GXL] R*192.005.108.rrr PASC-BB IBM PASC Broadband [50,GXL] 192.005.109.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] C*192.009.000.rrr-192.009.255.rrr SUN Microsystem, Inc. [WNJ] C*192.010.000.rrr-192.010.040.rrr Symbolics, Inc. [CH2] R 192.010.041.rrr SCRC-ETHERNET SCRC ETHERNET [108,CH2] C*192.010.042.rrr-192.010.255.rrr Symbolics, Inc. [CH2] C*192.011.000.rrr-192.011.255.rrr ATT, Bell Labs [MH12] C*192.012.000.rrr CADMUS-ETHERNET CADMUS-NET [MS9] C*192.012.001.rrr CADMUS-EXP-1 CADMUS-NET-EXP-1 [MS9] C*192.012.002.rrr CADMUS-EXP-2 CADMUS-NET-EXP-2 [MS9] C*192.012.003.rrr FLAIR Fairchild AI Lab Net [108,AMS1] C*192.012.004.rrr SCG-NET Hughes SCG Net [108,MXP] R 192.012.005.rrr AIC-LISPMS SRI-AIC-LispMachNet [108,PM4] R 192.012.006.rrr NPS-C2 NPS-C2 [108,AW9] R 192.012.007.rrr NYU-CS-ETHER NYU CompSci Ethernet [108,LOU] D 192.012.008.rrr PICANET1 Picatinny Arsenal LAN1[108,RFD1] R 192.012.009.rrr CADRE-NET Decision Systems Lab [SM6] R 192.012.010.rrr CORNELL-ENG Cornell-Engineering [108,BN9] R 192.012.011.rrr MIT-36 MIT Building 36 [108,RH60] R 192.012.012.rrr WISC-ETHER Wisconsin Ether Net [108,CBP] R 192.012.013.rrr JHU-NET1 JHU-NET1 [108,MO14] R 192.012.014.rrr JHU-NET2 JHU-NET2 [108,MO14] R 192.012.015.rrr BROOKNET BNL Brooknet III [108,GC] R 192.012.016.rrr PRMNET SRI-SURAN-EN [108,BP17] G 192.012.017.rrr LLL-TIS-NET LLL-TIS-NET [101,105,GP10]
R 192.012.018.rrr CIT-CS-10NET Caltech 10Meg EtherNet[107,AD22] R 192.012.019.rrr CIT-NET Caltech Campus Net [107,AD22] R 192.012.020.rrr CIT-SUN-NET Caltech Sun Net [107,AD22] R 192.012.021.rrr CIT-PHYSCOMP Caltech Phys Comp Net [107,AD22] R 192.012.022.rrr UTCSRES UTCS Net Research [108,JSQ1] R 192.012.023.rrr UTCSTTY UTCS TTY Kludgenet [108,JSQ1] R 192.012.024.rrr MICANET MITRE (Experimental) [JN2] R 192.012.025.rrr CSS-GRAMINAE CSS Workstation Net [53,RR2] R 192.012.026.rrr BBN-NETR Net-R Testbed at BBN [91,CP10] R 192.012.027.rrr UR-LASER UR Laser Energetics [108,WXL] 192.012.028.rrr-192.012.255.rrr Unassigned [JBP] D 192.013.000.rrr-192.014.255.rrr DODIIS Subnetworks [AY5] 192.015.000.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]
Ports are used in the TCP [33,78] 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 [33,76].
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.
Decimal Keyword Description References ------- ------- ----------- ---------- 0 Reserved [JBP] 1-4 Unassigned [JBP] 5 RJE Remote Job Entry [13,34,JBP] 7 ECHO Echo [67,JBP] 9 DISCARD Discard [66,JBP] 11 USERS Active Users [62,JBP] 13 DAYTIME Daytime [65,JBP] 15 NETSTAT Who is up or NETSTAT [JBP] 17 QUOTE Quote of the Day [72,JBP] 19 CHARGEN Character Generator [64,JBP] 20 FTP File Transfer [Default Data] [33,68,JBP] 21 FTP File Transfer [Control] [33,68,JBP] 23 TELNET Telnet [84,JBP] 25 SMTP Simple Mail Transfer [33,74,JBP] 27 NSW-FE NSW User System FE [18,RHT] 29 MSG-ICP MSG ICP [60,RHT] 31 MSG-AUTH MSG Authentication [60,RHT] 33 Unassigned [JBP] 35 any printer server [JBP] 37 TIME Time [80,JBP] 39 RLP Resource Location Protocol [1,MA] 41 GRAPHICS Graphics [34,98,JBP] 42 NAMESERVER Host Name Server [33,71,JBP] 43 NICNAME Who Is [33,42,JAKE] 44 MPM-FLAGS MPM FLAGS Protocol [JBP] 45 MPM Message Processing Module [recv] [70,JBP] 46 MPM MPM [default send] [76,JBP] 47 NI-FTP NI FTP [104,SK]
49 LOGIN Login Host Protocol [PHD1] 51 LA-MAINT IMP Logical Address Maintenance [57,AGM] 53 DOMAIN Domain Name Server [PM1] 55 ISI-GL ISI Graphics Language [10,RB6] 57 any private terminal access [JBP] 59 any private file service [JBP] 61 NI-MAIL NI MAIL [8,SK] 63 VIA-FTP VIA Systems - FTP [DXD] 65 Unassigned [JBP] 67 Unassigned [JBP] 69 TFTP Trivial File Transfer [33,87,KRS] 71 NETRJS Remote Job Service [12,34,RTB] 72 NETRJS Remote Job Service [12,34,RTB] 73 NETRJS Remote Job Service [12,34,RTB] 74 NETRJS Remote Job Service [12,34,RTB] 75 any private dial out service [JBP] 77 any private RJE service [JBP] 79 FINGER Finger [34,40,KLH] 81 HOSTS2 Name Server [EAK1] 83 HOSTS2-NS MIT ML Device [DPR] 85 MIT-ML-DEV MIT ML Device [DPR] 87 MIT-ML-DEV Any Private Terminal Link [JBP] 89 SU-MIT-TG SU/MIT Telnet Gateway [MRC] 91 MIT-DOV MIT Dover Spooler [EBM] 93 DCP Device Control Protocol [DT15] 95 SUPDUP SUPDUP [21,MRC] 97 SWIFT-RVF Swift Remote Vitural File Protocol [MXR] 99 METAGRAM Metagram Relay [GEOF] 101 HOSTNAME NIC Host Name Server [33,41,JAKE] 103 Unassigned [JBP] 105 CSNET-NS Mailbox Name Nameserver [96,MHS1] 107 RTELNET Remote Telnet Service [73,JBP] 109 POP Post Office Protocol [110,JKR1] 111 SUNRPC SUN Remote Procedure Call [DXG] 113 AUTH Authentication Service [99,MCSJ] 115 SFTP Simple File Transfer Protocol [54,MXL] 116 Unassigned [JBP] 117 UUCP-PATH UUCP Path Service [32,MAE] 118-129 Unassigned [JBP] 131 Unassigned [JBP] 132-223 Reserved [JBP] 224-241 Unassigned [JBP] 243 SUR-MEAS Survey Measurement [9,AV] 245 LINK LINK [14,RDB2] 247-255 Unassigned [JBP]
Reynolds & Postel [Page 15]
Assigned Numbers RFC 923 Autonomous System Numbers
ASSIGNED AUTONOMOUS SYSTEM NUMBERS
The Exterior Gateway Protocol (EGP) [93,90] 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.
The ARPANET facility for "logical addressing" is described in RFC 878 . A portion of the possible logical addresses are reserved 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.
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 .
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.
Decimal Description References ------- ----------- ---------- 0 Reserved [JBP] 1-149 Unassigned [JBP] 150 Xerox NS IDP [109,LLG] 151 Unassigned [JBP] 152 PARC Universal Protocol [11,HGM] 153 TIP Status Reporting [JGH] 154 TIP Accounting [JGH] 155 Internet Protocol [regular] [33,77,JBP] 156-158 Internet Protocol [experimental] [33,77,JBP] 159 Figleaf Link [JBW1] 160-195 Unassigned [JBP] 196-247 Experimental Protocols [JBP] 248-255 Network Maintenance [JGH]
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. For further information and SAP number assignments, please contact: Mr. Maris Graube, Chairman, IEEE 802, c/o Tektronix, P.O. Box 500, D/S 50-473, Beaverton, Oregon, 97077.
Service Access Point Description References -------------------- ----------- ---------- decimal binary 96 01100000 DOD IP [33,76,JBP]
MUX - Multiplexing Protocol NAMESERVER - Host Name Server NETED - Network Standard Text Editor NETRJS - Remote Job Service NI-FTP - NI File Transfer Protocol NI-MAIL - NI Mail Protocol NICNAME - Who Is Protocol NSW-FE - NSW User System Front End NVP-II - Network Voice Protocol POP - Post Office Protocol PRM - Packet Radio Measurement PUP - PUP Protocol QUOTE - Quote of the Day Protocol RDP - Reliable Data Protocol RJE - Remote Job Entry RLP - Resource Location Protocol RTELNET - Remote Telnet Service RVD - Remote Virtual Disk Protocol SAT-EXPAK - Satnet and Backroom EXPAK SAT-MON - SATNET Monitoring SFTP - Simple File Transfer Protocol SMTP - Simple Mail Transfer Protocol ST - Stream Protocol SU-MIT-TG - SU/MIT Telnet Gateway Protocol SUNRPC - SUN Remote Procedure Call SUPDUP - SUPDUP Protocol SUR-MEAS - Survey Measurement SWIFT-RVF - Remote Virtual File Protocol TCP - Transmission Control Protocol TELNET - Telnet Protocol TFTP - Trivial File Transfer Protocol TIME - Time Server Protocol TRUNK-1 - Trunk-1 Protocol TRUNK-2 - Trunk-2 Protocol UCL - University College London Protocol UDP - User Datagram Protocol USERS - Active Users Protocol UUCP-PATH - UUCP Path Service VIA-FTP - VIA Systems-File Transfer Protocol WB-EXPAK - Wideband EXPAK WB-MON - Wideband Monitoring XNET - Cross Net Debugger XNS-IDP - Xerox NS IDP
 BBN, "Specifications for the Interconnection of a Host and an IMP", Report 1822, Bolt Beranek and Newman, Cambridge, Massachusetts, revised, December 1981.
 Bennett, C., "A Simple NIFTP-Based Mail System", IEN 169, University College, London, January 1981.
 Bhushan, A., "A Report on the Survey Project", RFC 530, NIC 17375, June 1973.
 Bisbey, R., D. Hollingworth, and B. Britt, "Graphics Language (version 2.1)", ISI/TM-80-18, USC/Information Sciences Institute, July 1980.
 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.
 Braden, R., "NETRJS Protocol", RFC 740, NIC 42423, November 1977.
 Bressler, B., "Remote Job Entry Protocol", RFC 407, NIC 12112, October 72.
 Bressler, R., "Inter-Entity Communication -- An Experiment", RFC 441, NIC 13773, January 1973.
 Mills, D., "DCN Local Network Protocols", RFC 891, Linkabit, December 1983.
 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 December 1976.
 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.
 Postel, J., "Active Users", RFC 866, USC/Information Sciences Institute, May 1983.
 Postel, J., "A Standard for the Transmission of IP Datagrams over Experimental Ethernet Networks, RFC 895, USC/Information Sciences Institute, April 1984.
 Postel, J., "Character Generator Protocol", RFC 864, USC/Information Sciences Institute, May 1983.
 Postel, J., "Daytime Protocol", RFC 867, USC/Information Sciences Institute, May 1983.
 Postel, J., "Discard Protocol", RFC 863, USC/Information Sciences Institute, May 1983.
 Postel, J., "Echo Protocol", RFC 862, USC/Information Sciences Institute, May 1983.
 Postel, J., "File Transfer Protocol", RFC 765, IEN 149, USC/Information Sciences Institute, June 1980.
 Postel, J., "Internet Control Message Protocol - DARPA Internet Program Protocol Specification", RFC 792, USC/Information Sciences Institute, September 1981.
 Postel, J., "Internet Message Protocol", RFC 759, IEN 113, USC/Information Sciences Institute, August 1980.
 Postel, J., "Name Server", IEN 116, USC/Information Sciences Institute, August 1979.
 Postel, J., "Quote of the Day Protocol", RFC 865, USC/Information Sciences Institute, May 1983.
[AB13] Alison Brown CORNELL alison@CORNELL.ARPA [AD22] Arlene DesJardins CIT arlene@CIT-20.ARPA [AG22] Alfred Ganz YALE GANZ@YALE.ARPA [AGM] Andy Malis BBN Malis@BBN-UNIX.ARPA [AL6] Alexis Layton CCA alex@CCA-UNIX.ARPA [APS] Anita Skelton MITRE skelton@MITRE.ARPA [AP] Alan Parker NRL parker@NRL-CSS.ARPA [AV] Al Vezza MIT AV@MIT-XX.ARPA [AW9] Albert Wong NPS AWong@USC-ISI.ARPA [AXC] Albert Cheng UIUC acheng.uiuc@CSNET-RELAY.ARPA [AXG] Atul Garg HP ---none--- [AY5] Akiharu Yasuda DODIIS dia@PAXRV-NES.ARPA [BC14] Robert Cattani Columbia Cattani@COLUMBIA-20.ARPA [BG5] Bob Gilligan SRI Gilligan@SRI-KL.ARPA [BIM] Benson I. Margulies Honeywell Margulies@CISL.ARPA [BJN1] Bruce Nemnich TMC BJN@MIT-MC.ARPA [BML] Barry Leiner ARPA Leiner@USC-ISIA.ARPA [BN7] Bich T. Nguyen SRI btn@SRI-TSC.ARPA [BN9] Bill Nesheim CORNELL bill@CORNELL.ARPA [BP17] Bobbi Phillips SRI bobbi@SRI-TSC.ARPA [BXA] Bobby W. Allen YPG WYMER@OFFICE.ARPA [CAK] Chris Kent PURDUE Kent@PURDUE.ARPA [CBP] Brian Pinkerton Wisconson Brian@WISC-RSCH.ARPA [CC2] Chase Cotton UDEL Cotton@UDEL-EE.ARPA [CH2] Charles Hornig Symbolics Hornig@MIT-MC.ARPA [CJW2] Cliff Weinstein LL cjw@LL-11.ARPA [CLH3] Charles Hedrick RUTGERS Hedrick@RUTGERS.ARPA [CMR] Craig Rogers ISI Rogers@USC-ISIB.ARPA [CP10] Craig Partridge BBN craig@BBN-UNIX.ARPA [CXL] Clifford A. Lynch UCB UCDLA@BBNCCY.ARPA [DAM1] David A. Mosher UCB Mosher@BERKELEY.ARPA [DCP1] David Plummer MIT DCP@MIT-MC.ARPA [DT15] Dan Tappan BBN Tappan@BBNG.ARPA [DDC2] Dave Clark MIT-LCS Clark@MIT-MULTICS.ARPA [DG28] David L. Gehrt RIACS Dave@RIACS.ARPA [DH17] Douglas Hirsch BBN hirsch@BBN-UNIX.ARPA [DHH] Doug Hunt BBN DHunt@BBN-UNIX.ARPA [DJF] David J. Farber U of Del. Farber@UDEL-EE.ARPA [DJV1] Darrel J. Van Buer SDC vanbuer@ISI-VAXA.ARPA [DK2] Dean B. Krafft CORNELL Dean@CORNELL.ARPA [DLM1] David Mills LINKABIT Mills@USC-ISID.ARPA [DM11] Dale McNeill BBN mcneill@BBN-UNIX.ARPA [DPR] David Reed MIT-LCS DPR@MIT-XX.ARPA [DSW] Dan Whelan Caltech Dan@CIT-20.ARPA [DXD] Dennis J.W. Dube VIA Systems ---none--- [DXG] David Goldberg SMI sun!dg@BERKELEY.ARPA
[EAK1] Earl Killian LLL EAK@MIT-MC.ARPA [EBM] Eliot Moss MIT EBM@MIT-XX.ARPA [EC5] Ed Cain DCEC cain@EDN-UNIX.ARPA [EF5] Ed Franceschini NYU Franceschini@NYU.ARPA [EHP] Ed Perry SRI Perry@SRI-KL.ARPA [FAS] Fred Segovich Compion fred@COMPION-VMS.ARPA [FLM2] F. Lee Maybaum MILNET Maybaum@DDN1 [GEOF] Geoff Goodfellow SRI Geoff@DARCOM-KA.ARPA [GC] Graham Campbell BNL gc@BNL.ARPA [GG11] George Goble Purdue ghg@PURDUE.ARPA [GH29] Gregory Hidley UCSD hidley@NOSC.ARPA [GIH] Glenn I. Hastie II SRI Hastie@SRI-SPAM.ARPA [GP10] George Pavel LLNL liaison@LLL-TIS.ARPA [GXL] Guillermo A. Loyola IBM Loyola%ibm-sj@CSNET-RELAY.ARPA [HA] Howard Alt AIDS alt@AIDS-UNIX.ARPA [HCF2] Harry Forsdick BBN Forsdick@BBNG.ARPA [HDC1] Horst Clausen DFVLR Clausen@USC-ISID.ARPA [HDW2] Howard Wactlar CMU Wactlar@CMU-CS-A.ARPA [HGM] Hallam Murray PARC Murray.PA@PARC-MAXC.ARPA [HM] Hank Magnuski --- JOSE@PARC-MAXC.ARPA [JA1] Jules P. Aronson NLM Aronson@NLM-MCS.ARPA [JAKE] Jake Feinler SRI Feinler@SRI-KL.ARPA [JAR4] Jim Rees WASHINGTON JIM@WASHINGTON.ARPA [JAW3] Jil Westcott BBN Westcott@BBNF.ARPA [JBP] Jon Postel ISI Postel@USC-ISIF.ARPA [JBW1] Joseph Walters, Jr. BBN JWalters@BBN-UNIX.ARPA [JC11] Jim Clifford LANL jrc@LANL.ARPA [JCM] Jeff Mogul STANFORD Mogul@SU-SCORE.ARPA [JD21] Jonathan Dreyer BBN JDreyer@BBN-UNIX.ARPA [JDG] Jim Guyton RAND guyton@RAND-UNIX.ARPA [JEM] Jim Mathis SRI Mathis@SRI-KL.ARPA [JFH2] Jack Haverty BBN Haverty@BBN-UNIX.ARPA [JGH] Jim Herman BBN Herman@BBN-UNIX.ARPA [JG46] Jonathan Goodman YALE Goodman@YALE.ARPA [JKR1] Joyce K. Reynolds ISI JKREYNOLDS@USC-ISIF.ARPA [JN2] Jose Nabielsky MITRE jnd@MITRE.ARPA [JO5] John O'Donnell YALE ODonnell@YALE.ARPA [JR17] John L. Robinson CANADA DREO-CRC@USC-ISID.ARPA [JRM1] John Mullen MITRE Mullen@MITRE.ARPA [JRS8] Jeffrey R. Schwab PURDUE jrs@PURDUE.ARPA [JS38] Joseph Sventek LBL j@LBL-CSAM.ARPA [JSG5] Jon Goodridge BBN jsg@BBN-UNIX.ARPA [JSQ1] John S. Quarterman UT jsq@UT-SALLY.ARPA [JWF] Jim Forgie LL Forgie@BBNC.ARPA [JWO1] James W. O'Toole UMD james@MARYLAND.ARPA [KCS1] Kevin C. Smallwood PURDUE kcs@PURDUE.ARPA [KLH] Ken Harrenstien SRI KLH@NIC.ARPA [KRS] Karen Sollins MIT Sollins@MIT-XX.ARPA
[KTP] Kenneth T. Pogran BBN Pogran@BBN-UNIX.ARPA [KWP] Kevin W. Paetzold DEC Paetzold@DEC-MARLBORO.ARPA [LB1] Liudvikas Bukys ROCHESTER Bukys@ROCHESTER.ARPA [LCN] Lou Nelson AEROSPACE Lou@AEROSPACE.ARPA [LCS] Lou Schreier SRI Schreier@USC-ISID.ARPA [LH2] Lincoln Hu COLUMBIA Hu@COLUMBIA-20.ARPA [LLG] Larry Garlick XEROX Garlick@PARC-MAXC.ARPA [LOU] Lou Salkind NYU Salkind@NYU.ARPA [LM8] Liza Martin MIT-LCS Martin@MIT-XX.ARPA [LRB] Larry Bierma NPRDC Bierma@NPRDC.ARPA [MA] Mike Accetta CMU Accetta@CMU-CS-A.ARPA [MAB4] Mark Brown USC Mark@USC-ECLB.ARPA [MAE] Marc A. Elvy Harvard Elvy@HARVARD.ARPA [MBG] Michael Greenwald MIT-LCS Greenwald@MIT-MULTICS.ARPA [MB] Michael Brescia BBN Brescia@BBN-UNIX.ARPA [MCSJ] Mike StJohns AFDSC StJohns@MIT-MULTICS.ARPA [MDC] Martin D. Connor MIT AI Marty@MIT-MC.ARPA [MF31] Martin J. Fouts NASA-Ames nep.fouts@AMES-AMELIA.ARPA [MH12] Mark Horton ATT mark@BERKELEY.ARPA [MHS1] Marvin Solomon WISC Solomon@UWISC.ARPA [MJM2] Mike Muuss BRL Mike@BRL.ARPA [MK17] Mike Karels UCB Karels@UCB-ARPA.ARPA [MO2] Michael O'Brien RAND OBrien@RAND-UNIX.ARPA [MO14] Michael O'Donnel JHU Odonnel%jhu@CSNET-RELAY.ARPA [MRC] Mark Crispin Stanford Admin.MRC@SU-SCORE.ARPA [MS9] Martin Schoffstall CADMUS cadmus!schoff@SEISMO.ARPA [MTR] Marshall Rose Irvine MRose.UCI@RAND-RELAY.ARPA [MXL] Mark Lottor MIT MKL@MIT-XX.ARPA [MXM] Marc M. Meilleur COINS COINS@USC-ISI.ARPA [MXP] Michael K. Peterson HUGHES scgvaxd!mkp@CIT-VAX.ARPA [MXR] Mark A. Rosenstein MIT mar@MIT-BORAX.ARPA [MXS] Marc Shapiro INRIA Shapiro@CMU-CS-C.ARPA [NC3] J. Noel Chiappa MIT JNC@MIT-XX.ARPA [NMM] Mike Minnich UDELEE MMinnich@UDEL-EE.ARPA [NXK] Neil Katin HP hpda.neil@BERKELEY.ARPA [PA5] Philip Almquist Stanford Almquist@SU-SCORE.ARPA [PAM6] Paul McNabb RICE pam@PURDUE.ARPA [PG3] Phill Gross LINKABIT gross@DCN7.ARPA [PGM] Paul G. Milazzo RICE Milazzo@RICE.ARPA [PHD1] Pieter Ditmars BBN pditmars@BBN-UNIX.ARPA [PK] Peter Kirstein UCL Kirstein@USC-ISIA.ARPA [PM1] Paul Mockapetris ISI Mockapetris@USC-ISIF.ARPA [PM4] Paul Martin SRI PMartin@SRI-AI.ARPA [PS3] Paal Spilling NDRE Paal@NTA-VAX.ARPA [PXA] Phillip G. Apley Bitstream PGA@MIT-OZ.ARPA [PXB] Pat Boyle UBC boyle.ubc@CSNET-RELAY.ARPA [PXK] Philip R. Karn, Jr. BCR allegra!karn@BERKELEY.ARPA [PXM] Pat Marques NSRDC marques@DTRC.ARPA
[PXN] Peter Nellessen SIEMENS crtvax!pn@CMU-CS-SPICE.ARPA [RA11] Rick Adams CCI rlgvax!ra@SEISMO.ARPA [RB6] Richard Bisbey ISI Bisbey@USC-ISIB.ARPA [RBN1] Ronald Natalie, Jr. BRL ron@BRL-TGR.ARPA [RBW] Richard B. Wales UCLA wales@UCLA-LOCUS.ARPA [RC7] Robert Cole UCL robert@UCL-CS.ARPA [RDB2] Robert Bressler BBN Bressler@BBN-UNIX.ARPA [RDR4] Dennis Rockwell BBN DRockwell@BBN-UNIX.ARPA [REK2] Robert Kahn ARPA Kahn@USC-ISIA.ARPA [RF1] Randy Frank UTAH Frank@UTAH-20.ARPA [RFD1] Robert F. Donnelly ARDC donnelly@ARDC.ARPA [RH6] Robert Hinden BBN Hinden@BBN-UNIX.ARPA [RH60] Roger Hale MIT Network%MIT-BUGS@MIT-MC.ARPA [RHT] Robert Thomas BBN BThomas@BBNG.ARPA [RK1] Richard Kovalcik Honeywell Kovalcik@MIT-MULTICS.ARPA [RKJ2] Richard Johnsson DEC johnsson@DECWRL.ARPA [RLB1] Bob Brown USRA rlb@AMES-VMSB.ARPA [RLB3] Ronald L. Broersma NOSC Ron@NOSC.ARPA [RLH2] Ronald L. Hartung NSWC ron@NSWC-WO.ARPA [RLS6] Ronald L. Smith COINS COINS@USC-ISIA.ARPA [RNM1] Neil MacKenzie RSRE T45@USC-ISID.ARPA [RR2] Raleigh Romine Teledyne romine@SEISMO.ARPA [RR18] Ron Reisor UDEL ron.udel-cc-relay@UDEL.ARPA [RS23] Russel Sandberg WISC root@UWISC.ARPA [RTB] Bob Braden UCLA Braden@USC-ISIA.ARPA [RWS4] Robert W. Scheifler ARGUS RWS@MIT-XX.ARPA [SA1] Sten Andler ARPA andler.ibm-sj@CSNET-RELAY.ARPA [SC3] Steve Casner ISI Casner@USC-ISIB.ARPA [SGC] Steve Chipman BBN Chipman@BBNA.ARPA [SK] Steve Kille UCL UKSAT@USC-ISID.ARPA [SM6] Sean McLinden DSL SMcLinden@CADRE.ARPA [SMF] Steven M. Feldman TYMNET feldman%ucbarpa@BERKELEY.ARPA [SXB] Steve Byrne TARTAN Byrne@CMU-CS-C.ARPA [SXB1] Scott Bradner HARVARD bradner@HARV.10.ARPA [SXM] Scott Marcus Spartacus ---none--- [TBS] Claude S. Steffey WSMR csteffey@WSMR70A.ARPA [TC4] Tony Cincotta DTNSRDC tony@NALCON.ARPA [TF6] Thomas Ferrin UCSF ucsfcgl!tef@BERKELEY.ARPA [TW11] Tom Wadlow LLL TAW@S1-A.ARPA [TXN] Todd Nugent U Chicago Nugent@ANL-MCS.ARPA [UXB] Ulf Bilting CHALMERS bilting@PURDUE.ARPA [WG] Wayne Graves LBL wayne@LBL-CSAM.ARPA [WIM] William Macgregor BBN macg@BBN.ARPA [WNJ] Bill Joy SMI sun!wnj@BERKELEY.ARPA [WXL] William Lampeter UR bill@ROCHESTER.ARPA [ZSU] Zaw-Sing Su SRI ZSu@SRI-TSC.ARPA
The network numbers in class A, B, and C network addresses are allocated among Research, Defense, Government (Non-Defense) and Commercial uses.
Class A (highest-order bit 0)
Research allocation: 8 Defense allocation: 24 Government allocation: 24 Commercial allocation: 94 Reserved Addresses: (0, 127) Total 128
Class B (highest-order bits 1-0)
Research allocation: 1024 Defense allocation: 3072 Government allocation: 3072 Commercial allocation: 12286 Reserved Addresses: (0, 16383) Total 16384
Class C (highest-order bits 1-1-0)
Research allocation: 65536 Defense allocation: 458725 Government allocation: 458725 Commercial allocation: 1572862 Reserved Addresses: (0, 2097151) Total 2097152
Class D (highest-order bits 1-1-1)
All addresses in this class are reserved for future use.
Within the Research community, 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 Research to Defense, Government or Commercial status. Thus, network identifiers may change state among Research, Defense, Government and Commercial, but the number of identifiers allocated to each use must remain within the limits indicated above. To make possible this fluid assignment, the network identifier spaces are not allocated by simple partition, but rather by specific assignment.
These assignments are shared by the four communities.
These assignments are shared by the four communities.
ARPANET Link Numbers
These assignments are shared by the four communities.
IP Version Numbers
These assignments are shared by the four communities.
TCP, IP and Telnet Option Identifiers
These assignments are shared by the four communities.
Joyce Reynolds is the coordinator for all number assignments.