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IETF RFC 776
Assigned numbers
Last modified on Thursday, October 15th, 1992
 Permanent link to RFC 776
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Network Working Group J. Postel
Request for Comments: 776 ISI
January 1981
Obsoletes RFCs: 770, 762, 758,
755, 750, 739, 604, 503, 433, 349
Obsoletes IENs: 127, 117, 93
ASSIGNED NUMBERS
This Network Working Group Request for Comments documents the currently
assigned values from several series of numbers used in network protocol
implementations. This RFC will be updated periodically, and in any case
current information can be obtained from Jon Postel. The assignment of
numbers is also handled by Jon. If you are developing a protocol or
application that will require the use of a link, socket, port, protocol,
or network number please contact Jon to receive a number assignment.
Jon Postel
USC - Information Sciences Institute
4676 Admiralty Way
Marina del Rey, California 90291
phone: (213) 822-1511
ARPANET mail: POSTEL@ISIF
Most of the protocols mentioned here are documented in the RFC series of
notes. The more prominent and more generally used are documented in the
Protocol Handbook [17] prepared by the Network Information Center (NIC).
Some of the items listed are undocumented. In all cases the name and
mailbox of the responsible individual is indicated. In the lists that
follow a bracketed entry, e.g. [17,iii], at the right hand margin of the
page indicates a reference for the listed protocol, where the number
cites the document and the "iii" cites the person.
Postel PAGE 1 
RFC 776 January 1981
Assigned Numbers
Network Numbers
ASSIGNED NETWORK NUMBERS
This list of network numbers is used in the internet address [8], the
field is 8 bits in size.
Assigned Network Numbers
Decimal Octal Name Network References
------- ----- ---- ------- ----------
0 0 Reserved [JBP]
1 1 BBN-PR BBN Packet Radio Network [DCA2]
2 2 SF-PR-1 SF Packet Radio Network (1) [JEM]
3 3 BBN-RCC BBN RCC Network [SGC]
4 4 SATNET Atlantic Satellite Network [DM11]
5 5 SILL-PR Ft. Sill Packet Radio Network [JEM]
6 6 SF-PR-2 SF Packet Radio Network (2) [JEM]
7 7 CHAOS MIT CHAOS Network [MOON]
8 10 CLARKNET SATNET subnet for Clarksburg [DM11]
9 11 BRAGG-PR Ft. Bragg Packet Radio Network [JEM]
10 12 ARPANET ARPANET [17,1,VGC]
11 13 UCLNET University College London [PK]
12 14 CYCLADES CYCLADES [VGC]
13 15 Unassigned [JBP]
14 16 TELENET TELENET [VGC]
15 17 EPSS British Post Office EPSS [PK]
16 20 DATAPAC DATAPAC [VGC]
17 21 TRANSPAC TRANSPAC [VGC]
18 22 LCSNET MIT LCS Network [43,10,DDC2]
19 23 TYMNET TYMNET [VGC]
20 24 DC-PR D.C. Packet Radio Network [VGC]
21 25 EDN DCEC EDN [EC5]
22 26 DIALNET DIALNET [26,16,MRC]
23 27 MITRE MITRE Cablenet [44,APS]
24 30 BBN-LOCAL BBN Local Network [SGC]
25 31 RSRE-PPSN RSRE / PPSN [BD2]
26 32 AUTODIN-II AUTODIN II [EC5]
27 33 NOSC-LCCN NOSC / LCCN [KTP]
28 34 WIDEBAND Wide Band Satellite Network [CJW2]
29 35 DCN-COMSAT COMSAT Dist. Comp. Network [DLM1]
30 36 DCN-UCL UCL Dist. Comp. Network [PK]
31 37 BBN-SAT-TEST BBN SATNET Test Network [DM11]
32 40 UCL-CR1 UCL Cambridge Ring 1 [PK]
33 41 UCL-CR2 UCL Cambridge Ring 2 [PK]
34 42 MATNET Mobile Access Terminal Net [DM11]
35 43 NULL UCL/RSRE Null Network [BD2]
36 44 SU-NET Stanford University Ethernet [MRC]
Postel PAGE 2
RFC 776 January 1981
Assigned Numbers
Network Numbers
37 45 DECNET Digital Equipment Network [DRL]
38 46 DECNET-TEST Test Digital Equipment Net [DRL]
39 47 SRINET SRI Local Network [GEOF]
40 50 CISLNET CISL Multics Network [CH2]
41 51 BBN-LN-TEST BBN Local Network Testbed [KTP]
42-254 50-376 Unassigned [JBP]
255 377 Reserved [JBP]
ASSIGNED INTERNET VERSION NUMBERS
In the Internet Protocol (IP) [33] there is a field to identify the
version of the internetwork general protocol. This field is 4 bits
in size.
Assigned Internet Version Numbers
Decimal Octal Version References
------- ----- ------- ----------
0 0 Reserved [JBP]
1-3 1-3 Unassigned [JBP]
4 4 Internet Protocol [33,JBP]
5 5 ST Datagram Mode [20,JWF]
6-14 6-16 Unassigned [JBP]
15 17 Reserved [JBP]
Postel PAGE 3
RFC 776 January 1981
Assigned Numbers
Internet Protocol Numbers
ASSIGNED INTERNET PROTOCOL NUMBERS
In the Internet Protocol (IP) [33] 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 Numbers References
------- ----- ---------------- ----------
0 0 Reserved [JBP]
1 1 raw internet datagrams [33,JBP]
2 2 Unassigned [JBP]
3 3 Gateway-to-Gateway [48,49,VMS]
4 4 CMCC Gateway Monitoring Message [18,19,DFP]
5 5 ST [20,JWF]
6 6 TCP [34,JBP]
7 7 UCL [PK]
8 10 Unassigned [JBP]
9 11 Secure [VGC]
10 12 BBN RCC Monitoring [VMS]
11 13 NVP [12,DC]
12 14 PUP [4,EAT3]
13 15 Pluribus [RDB2]
14 16 Telenet [RDB2]
15 17 XNET [25,JFH2]
16 20 Chaos [MOON]
17 21 User Datagram [42,JBP]
18 22 Multiplexing [13,JBP]
19 23 DCN [DLM1]
20 24 TAC Monitoring [RH6]
21-62 25-76 Unassigned [JBP]
63 77 any local network [JBP]
64 100 SATNET and Backroom EXPAK [DM11]
65-68 101-104 Unassigned [JBP]
69 105 SATNET Monitoring [DM11]
70 106 Unassigned [JBP]
71 107 Internet Packet Core Utility [DM11]
72-75 110-113 Unassigned [JBP]
76 114 Backroom SATNET Monitoring [DM11]
77 115 Unassigned [JBP]
78 116 WIDEBAND Monitoring [DM11]
79 117 WIDEBAND EXPAK [DM11]
80-254 120-376 Unassigned [JBP]
255 377 Reserved [JBP]
Postel PAGE 4
RFC 776 January 1981
Assigned Numbers
Port or Socket Numbers
ASSIGNED PORT or SOCKET NUMBERS
Ports are used in the TCP [34] and sockets are used in the AHHP
[28,17] to name the ends of logical connections which carry long term
conversations. For the purpose of providing services to unknown
callers a service contact socket is defined. This list specifies the
port or socket used by the server process as its contact socket. In
the AHHP an Initial Connection Procedure ICP [39,17] is used between
the user process and the server process to make the initial contact
and establish the long term connections leaving the contact socket
free to handle other callers. In the TCP no ICP is necessary since a
port may engage in many simultaneous connections.
The assigned ports/sockets use a small part of the possible
port/socket numbers. The assigned ports/sockets have all except the
low order eight bits cleared to zero. The low order eight bits are
specified here.
Socket Assignments:
General Assignments:
Decimal Octal Description
------- ----- -----------
0-63 0-77 Network Wide Standard Function
64-131 100-203 Hosts Specific Functions
132-223 204-337 Reserved for Future Use
224-255 340-377 Any Experimental Function
Postel PAGE 5
RFC 776 January 1981
Assigned Numbers
Port or Socket Numbers
Specific Assignments:
Network Standard Functions
Decimal Octal Description References
------- ----- ----------- ----------
1 1 Old Telnet [40,JBP]
3 3 Old File Transfer [27,11,24,JBP]
5 5 Remote Job Entry [6,17,JBP]
7 7 Echo [35,JBP]
9 11 Discard [32,JBP]
11 13 Who is on or SYSTAT [JBP]
13 15 Date and Time [JBP]
15 17 Who is up or NETSTAT [JBP]
17 21 Short Text Message [JBP]
19 23 Character generator or TTYTST [31,JBP]
21 25 New File Transfer [36,JBP]
23 27 New Telnet [41,JBP]
25 31 Unassigned [JBP]
27 33 NSW User System w/COMPASS FE [14,RHT]
29 35 MSG-3 ICP [29,RHT]
31 37 MSG-3 Authentication [29,RHT]
33 41 Unassigned [JBP]
35 43 IO Station Spooler [JBP]
37 45 Time Server [22,JBP]
39 47 Unassigned [JBP]
41 51 Graphics [46,17,JBP]
42 52 Name Server [38,JBP]
43 53 WhoIs [JAKE]
45 55 Message Processing Module [37,JBP]
47 57 NI FTP [50,CJB]
49 61 RAND Network Graphics Conference [30,MO2]
51 63 Unassigned [JBP]
53 65 AUTODIN II FTP [21,EC5]
55 67 ISI Graphics Language [3,RB6]
57 71 Mail Transfer [45,JBP]
59-63 73-77 Unassigned [JBP]
Postel PAGE 6
RFC 776 January 1981
Assigned Numbers
Port or Socket Numbers
Host Specific Functions
Decimal Octal Description References
------- ----- ----------- ----------
65 101 Unassigned [JBP]
67 103 Datacomputer at CCA [8,JZS]
69 105 Unassigned [JBP]
69 105 Trivial File Transfer [47,KRS]
71 107 NETRJS (EBCDIC) at UCLA-CCN [5,17,RTB]
73 111 NETRJS (ASCII-68) at UCLA-CCN [5,17,RTB]
75 113 NETRJS (ASCII-63) at UCLA-CCN [5,17,RTB]
77 115 any private RJE server [JBP]
79 117 Name or Finger [23,17,KLH]
81 121 Unassigned [JBP]
83 123 MIT ML Device [MOON]
85 125 MIT ML Device [MOON]
87 127 any terminal link [JBP]
89 131 SU/MIT Telnet Gateway [MRC]
91 133 MIT Dover Spooler [EBM]
93 135 Unassigned [JBP]
95 137 SUPDUP [15,MRC]
97 141 Datacomputer Status [8,JZS]
99 143 CADC - NIFTP via UCL [PLH]
101 145 NPL - NIFTP via UCL [PLH]
103 147 BNPL - NIFTP via UCL [PLH]
105 151 CAMBRIDGE - NIFTP via UCL [PLH]
107 153 HARWELL - NIFTP via UCL [PLH]
109 155 SWURCC - NIFTP via UCL [PLH]
111 157 ESSEX - NIFTP via UCL [PLH]
113 161 RUTHERFORD - NIFTP via UCL [PLH]
115-129 163-201 Unassigned [JBP]
131 203 Datacomputer [8,JZS]
Reserved for Future Use
Decimal Octal Description References
------- ----- ----------- ----------
132-223 204-337 Reserved [JBP]
Postel PAGE 7
RFC 776 January 1981
Assigned Numbers
Port or Socket Numbers
Experimental Functions
Decimal Octal Description References
------- ----- ----------- ----------
224-239 340-357 Unassigned [JBP]
241 361 NCP Measurement [9,JBP]
243 363 Survey Measurement [2,AV]
245 365 LINK [7,RDB2]
247 367 TIPSRV [RHT]
249-255 371-377 RSEXEC [51,RHT]
ASSIGNED LINK NUMBERS
The word "link" here refers to a field in the original ARPANET
Host/IMP interface leader. The link was originally defined as an 8
bit field. Some time after the ARPANET Host-to-Host (AHHP) protocol
was defined and, by now, some time ago the definition of this field
was changed to "Message-ID" and the length to 12 bits. The name link
now refers to the high order 8 bits of this 12 bit message-id field.
The low order 4 bits of the message-id field are to be zero unless
specifically specified otherwise for the particular protocol used on
that link. The Host/IMP interface is defined in BBN report 1822 [1].
Link Assignments:
Decimal Octal Description References
------- ----- ----------- ----------
0 0 AHHP Control Messages [28,17,JBP]
1 1 Reserved [JBP]
2-71 2-107 AHHP Regular Messages [28,17,JBP]
72-150 110-226 Reserved [JBP]
151 227 CHAOS Protocol [MOON]
152 230 PARC Universal Protocol [4,EAT3]
153 231 TIP Status Reporting [JGH]
154 232 TIP Accounting [JGH]
155 233 Internet Protocol (regular) [33,JBP]
156-158 234-236 Internet Protocol (experimental) [33,JBP]
159-191 237-277 Measurements [9,VGC]
192-195 300-303 Unassigned [JBP]
196-255 304-377 Experimental Protocols [JBP]
224-255 340-377 NVP [12,17,DC]
248-255 370-377 Network Maintenance [JGH]
Postel PAGE 8
RFC 776 January 1981
Assigned Numbers
Documents
DOCUMENTS
---------
[1] BBN, "Specifications for the Interconnection of a Host and an
IMP", Report 1822, Bolt Beranek and Newman, Cambridge,
Massachusetts, May 1978.
[2] Bhushan, A., "A Report on the Survey Project", RFC 530,
NIC 17375, 22 June 1973.
[3] Bisbey, R., D. Hollingworth, and B. Britt, "Graphics Language
(version 2.1)", ISI/TM-80-18, USC/Information Sciences
Institute, July 1980.
[4] 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.
[5] Braden, R., "NETRJS Protocol", RFC 740, NIC 42423,
22 November 1977. Also in [17].
[6] Bressler, B., "Remote Job Entry Protocol", RFC 407, NIC
12112, 16 October 72. Also in [17].
[7] Bressler, R., "Inter-Entity Communication -- An Experiment",
RFC 441, NIC 13773, 19 January 1973.
[8] CCA, "Datacomputer Version 5/4 User Manual", Computer
Corporation of America, August 1979.
[9] Cerf, V., "NCP Statistics", RFC 388, NIC 11360,
23 August 1972.
[10] Clark, D., "Revision of DSP Specification", Local Network Note
9, Laboratory for Computer Science, MIT, 17 June 1977.
[11] Clements, R., "FTPSRV -- Extensions for Tenex Paged Files",
RFC 683, NIC 32251, 3 April 1975. Also in [17].
[12] Cohen, D., "Specifications for the Network Voice Protocol
(NVP)", NSC Note 68, 29 January 1976. Also as USC/Information
Sciences Institute RR-75-39, March 1976, and as RFC 741,
NIC 42444, 22 November 1977. Also in [17].
Postel PAGE 9
RFC 776 January 1981
Assigned Numbers
Documents
[13] Cohen, D. and J. Postel, "Multiplexing Protocol", IEN 90,
USC/Information Sciences Institute, May 1979.
[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] Crispin, M. and I. Zabala, "DIALNET Protocols", Stanford
University Artificial Intelligence Laboratory, July 1978.
[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] Flood Page, D., "Gateway Monitoring Protocol", IEN 131,
February 1980.
[19] Flood Page, D., "CMCC Performance Measurement Message
Formats", IEN 157, September 1980.
[20] Forgie, J., "ST - A Proposed Internet Stream Protocol",
IEN 119, M.I.T. Lincoln Laboratory, September 1979.
[21] Forsdick, H., and A. McKenzie, "FTP Functional Specification",
Bolt Beranek and Newman, Report 4051, August 1979.
[22] Harrenstien, K., J. Postel, "Time Server", IEN 142,
April 1980. Also in [17].
[23] Harrenstien, K., "Name/Finger", RFC 742, NIC 42758,
30 December 1977. Also in [17].
[24] Harvey, B., "One More Try on the FTP", RFC 691, NIC 32700,
6 June 1975.
[25] Haverty, J., "XNET Formats for Internet Protocol Version 4",
IEN 158, October 1980.
[26] McCarthy, J. and L. Earnest, "DIALNET", Stanford University
Artificial Intelligence Laboratory, Undated.
Postel PAGE 10
RFC 776 January 1981
Assigned Numbers
Documents
[27] McKenzie, A., "File Transfer Protocol", RFC 454, NIC 14333,
16 February 1973.
[28] McKenzie,A., "Host/Host Protocol for the ARPA Network",
NIC 8246, January 1972. Also in [17].
[29] 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.
[30] O'Brien, M., "A Network Graphical Conferencing System", RAND
Corporation, N-1250-ARPA, August 1979.
[31] Postel, J., "Character Generator Process", RFC 429, NIC 13281,
12 December 1972.
[32] Postel, J., "Discard Process", RFC 348, NIC 10427,
30 May 1972.
[33] Postel, J., ed., "DOD Standard Internet Protocol", IEN 128,
RFC 760, USC/Information Sciences Institute, NTIS ADA079730,
January 1980. Appears in: Computer Communication Review,
Special Interest Group on Data Communications, ACM, V.10, N.4,
October 1980.
[34] Postel, J., ed., "DOD Standard Transmission Control Protocol",
IEN 129, RFC 761, USC/Information Sciences Institute,
NTIS ADA082609, January 1980. Appears in: Computer
Communication Review, Special Interest Group on Data
Communications, ACM, V.10, N.4, October 1980.
[35] Postel, J., "Echo Process", RFC 347, NIC 10426, 30 May 1972.
[36] Postel, J., "File Transfer Protocol", RFC 765, IEN 149,
June 1980.
[37] Postel, J., "Internet Message Protocol", RFC 759, IEN 113,
USC/Information Sciences Institute, August 1980.
[38] Postel, J., "Name Server", IEN 116, USC/Information Sciences
Institute, August 1979.
[39] Postel, J., "Official Initial Connection Protocol", NIC 7101,
11 June 1971. Also in [17].
Postel PAGE 11
RFC 776 January 1981
Assigned Numbers
Documents
[40] Postel, J., "Telnet Protocol", RFC 318, NIC 9348,
3 April 1972.
[41] Postel, J., "Telnet Protocol Specification", RFC 764, IEN 148,
June 1980.
[42] Postel, J., "User Datagram Protocol", RFC 768 USC/Information
Sciences Institute, August 1980.
[43] Reed, D., "Protocols for the LCS Network", Local Network Note
3, Laboratory for Computer Science, MIT, 29 November 1976.
[44] Skelton, A., S. Holmgren, and D. Wood, "The MITRE Cablenet
Project", IEN 96, April 1979.
[45] Sluizer, S., and J. Postel, "Mail Transfer Protocol", RFC 772,
USC/Information Sciences Institute, September 1980.
[46] Sproull, R., and E. Thomas. "A Networks Graphics Protocol",
NIC 24308, 16 August 1974. Also in [17].
[47] Sollins, K., "The TFTP Protocol", IEN 133, MIT/LCS,
January 1980.
[48] Strazisar, V., "Gateway Routing: An Implementation
Specification", IEN 30, Bolt Berenak and Newman, April 1979.
[49] Strazisar, V., "How to Build a Gateway", IEN 109, Bolt Berenak
and Newman, August 1979.
[50] The High Level Protocol Group, "A Network Independent File
Transfer Protocol", INWG Protocol Note 86, December 1977.
[51] Thomas, R., "A Resource Sharing Executive for the ARPANET",
AFIPS Conference Proceedings, 42:155-163, NCC, 1973.
Postel PAGE 12
RFC 776 January 1981
Assigned Numbers
People
PEOPLE
------
[DCA2] Don Allen BBN Allen@BBND
[CJB] Chris Bennett UCL UKSAT@ISIE
[RB6] Richard Bisbey ISI Bisbey@ISIB
[RTB] Bob Braden UCLA Braden@ISIA
[RDB2] Robert Bressler BBN Bressler@BBNE
[EC5] Ed Cain DCEC cain@EDN-Unix
[VGC] Vint Cerf ARPA Cerf@ISIA
[SGC] Steve Chipman BBN Chipman@BBNA
[DDC2] David Clark MIT Clark@MIT-Multics
[DC] Danny Cohen ISI Cohen@ISIB
[MRC] Mark Crispin Stanford Admin.MRC@SU-SCORE
[BD2] Brian Davies RSRE T45@ISIE
[JAKE] Jake Feinler SRI Feinler@SRI-KL
[DFP] David Flood Page BBN DFloodPage@BBNE
[JWF] Jim Forgie LL Forgie@BBNC
[GEOF] Geoff Goodfellow SRI Geoff@DARCOM-KA
[KLH] Ken Harrenstien MIT KLH@MIT-AI
[JFH2] Jack Haverty BBN JHaverty@BBN-Unix
[JGH] Jim Herman BBN Herman@BBNE
[PLH] Peter Higginson UCL UKSAT@ISIE
[RH6] Robert Hinden BBN Hinden@BBNE
[CH2] Charles Hornig Honeywell Hornig@MIT-Multics
[PK] Peter Kirstein UCL Kirstein@ISIA
[DRL] David Lyons DEC Lyons@DEC-2136
[JEM] Jim Mathis SRI Mathis@SRI-KL
[DM11] Dale McNeill BBN DMcNeill@BBNE
[DLM1] David Mills COMSAT Mills@ISIE
[MOON] David Moon MIT Moon@MIT-MC
[EBM] Eliot Moss MIT EBM@MIT-XX
[MO2] Michael O'Brien RAND OBrien@RAND-Unix
[KTP] Ken Pogran BBN Pogran@BBND
[JBP] Jon Postel ISI Postel@ISIF
[JZS] Joanne Sattely CCA JZS@CCA
[APS] Anita Skelton MITRE skelton@MITRE
[KRS] Karen Sollins MIT Sollins@MIT-XX
[VMS] Virginia Strazisar BBN Strazisar@BBNA
[EAT3] Ed Taft XEROX Taft.PA@PARC
[RHT] Robert Thomas BBN Thomas@BBNA
[AV] Al Vezza MIT AV@MIT-XX
[CJW2] Cliff Weinstein LL cjw@LL-11
Postel PAGE 13
Assigned numbers
RFC TOTAL SIZE: 30311 bytes
PUBLICATION DATE: Thursday, October 15th, 1992
LEGAL RIGHTS: The IETF Trust (see BCP 78)
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