RFC 750
Assigned numbers
ASSIGNED NUMBERS 🎀
Okay bestie, this is RFC 750, titled Assigned Numbers ✨. It was written by J. Postel at USC-ISI and dated 26 September 1978. The page header also says NWG/RFC 750, JBP 26-Sep-78 18:30, and NIC 45500. It obsoletes 739, 604, 503, 433, and 349 💅. The original doesn't list a category, so I'm not adding one.
This RFC is the official list of the numbers that are already assigned across a bunch of different protocol series. Think of it as the big cute phonebook of who got which number 📒🌸. It gets updated from time to time, and the most current info comes straight from Jon Postel. Jon also handles the assignments, so if you're building a protocol or app that needs a link, socket, or whatever, you have to contact Jon to get a number 🫶.
Here's Jon's contact card:
Jon Postel
USC - Information Sciences Institute
4676 Admiralty Way
Marina del Rey, California 90291
phone: (213) 822-1511
ARPANET mail: POSTEL@ISIBMost of the protocols in here are written up in the RFC series 📜. The biggest, most-used ones are in the Protocol Handbook [1], which the Network Information Center (NIC) put together 📖. In the lists below, a bracketed number like [1] sitting off to the right is the reference for that protocol 🔥.
ASSIGNED LINK NUMBERS 🔗
Okay, so a "link" here is a field from the original ARPANET Host/IMP interface leader 🧚. At first it was an 8-bit field. Then, a while after the ARPANET Host-to-Host (AHHP) protocol was defined (which was ages ago now, lol 💀), the field got renamed to "Message-ID" and expanded to 12 bits. The name "link" now refers to the high-order 8 bits of that 12-bit message-id 💜. The low-order 4 bits of the message-id are supposed to be zero, unless a particular protocol on that link says otherwise 🙈. The Host/IMP interface itself is defined in BBN report 1822 [2] ✨.
Here's the link assignment list:
Decimal Octal Description References
------- ----- ----------- ----------
0 0 AHHP Control Messages [1,3]
1 1 Reserved
2-71 2-107 AHHP Regular Messages [1,3]
72-151 110-227 Reserved
152 230 PARC Universal Protocol
153 231 TIP Status Reporting
154 232 TIP Accounting
155-158 233-236 Internet Protocol [35,36,42,43,44]
159-191 237-277 Measurements [28]
192-195 300-303 Message Switching Protocol [4,5]
196-255 304-377 Experimental Protocols
224-255 340-377 NVP [1,39]ASSIGNED SOCKET NUMBERS 🧦
Sockets are how the AHHP [1,3] names the two ends of a logical connection, the kind that carries long-term conversations 💬. To serve every caller, there's an Initial Connection Procedure (ICP) [1,34] between the user process and the server process 🌈. This list tells you which socket the server process uses as its contact socket 🦋.
Socket Assignments
General Assignments
Decimal Octal Description
------- ----- -----------
0-63 0-77 Network Wide Standard Function
64-127 100-177 Hosts Specific Functions
128-223 200-337 Reserved for Future Use
224-255 340-377 Any Experimental FunctionSpecific Assignments
Network Standard Functions
Decimal Octal Description References
------- ----- ----------- ----------
1 1 Old Telnet [6]
3 3 Old File Transfer [7,8,9]
5 5 Remote Job Entry [1,10]
7 7 Echo [11]
9 11 Discard [12]
11 13 Who is on or SYSTAT
13 15 Date and Time
15 17 Who is up or NETSTAT
17 21 Short Text Message
19 23 Character generator or TTYTST [13]
21 25 New File Transfer [1,14,15]
23 27 New Telnet [1,16,17]
25 31 Distributed Programming System [18,19]
27 33 NSW User System w/COMPASS FE [20]
29 35 MSG-3 ICP [21]
31 37 MSG-3 Authentication [21]
33 41 DPS ICP [18,19]
35 43 IO Station Spooler
37 45 Time Server [1,22]
39 47 NSW User System w/SRI FE [20]
41 51 Graphics [1,26]
42-63 52-77 unassignedHost Specific Functions
Decimal Octal Description References
------- ----- ----------- ----------
65 101 Speech Data Base at LL-TX-2 [23]
67 103 Datacomputer at CCA [24]
69 105 CPYNET
71 107 NETRJS (EBCDIC) at UCLA-CCN [1,25]
73 111 NETRJS (ASCII-68) at UCLA-CCN [1,25]
75 113 NETRJS (ASCII-63) at UCLA-CCN [1,25]
77 115 any private RJE server
79 117 Name or Finger [1,40]
81 121 Network BSYS
83 123 MIT ML Device
85 125 MIT ML Device
86-94 126-136 unassigned
95 137 SUPDUP [33]
97 141 Datacomputer Status
98-127 142-136 unassignedReserved for Future Use
Decimal Octal Description References
------- ----- ----------- ----------
128-223 200-337 reservedExperimental Functions
Decimal Octal Description References
------- ----- ----------- ----------
224-231 340-347 unassigned
232-237 350-355 Authorized Mailer at BBN
239 357 unassigned
241 361 NCP Measurement [27,28]
243 363 Survey Measurement [28,29,30]
245 365 LINK [31]
247 367 TIPSRV
249-255 371-377 RSEXEC [31,32]ASSIGNED NETWORK NUMBERS 🌍
This list of network numbers is for the internetwork protocols that are still being built 🛠️. The field is 8 bits wide 💅.
Assigned Network Numbers
Decimal Octal Network References
------- ----- ------- ----------
0 0 Reserved
1 1 BBN Packet Radio Network
2 2 SF Bay Area Packet Radio Network (1)
3 3 BBN RCC Network
4 4 Atlantic Satellite Network
5 5 Washington D.C. Packet Radio Network
6 6 SF Bay Area Packet Radio Network (2)
7 7 CHAOS Network
8 10 BBN SATNET Test Network
9 11 Ft. Gordon Packet Radio Network
10 12 ARPANET [1,2]
11 13 University College London Network
12 14 CYCLADES
13 15 National Physical Laboratory
14 16 TELENET
15 17 British Post Office EPSS
16 20 DATAPAC
17 21 TRANSPAC
18 22 LCS Network [37,38]
19 23 TYMNET
20 24 Ft. Sill Packet Radio Network
21 25 DCEC EDN
22-254 26-376 Unassigned
255 377 ReservedASSIGNED INTERNET MESSAGE VERSIONS 🦄
In the internetwork protocols there's a field that tells you which version of the internetwork general protocol you're looking at 👑. That field is 4 bits in size 🎀.
Assigned Internet Message Versions
Decimal Octal Version References
------- ----- ------- ----------
0 0 March 1977 version [35]
1 1 January 1978 version [36]
2 2 February 1978 version A [42]
3 3 February 1978 version B [43]
4 4 September 1978 version 4 [44]
5-14 5-16 Unassigned
15 17 ReservedASSIGNED INTERNET MESSAGE FORMATS 🍓
In several of the internetwork protocol versions there's a field that identifies the format of the host-level specific protocol 🧚♀️. That field is 8 bits in size, and it's called either Format or Protocol 💜.
Assigned Internet Message Formats
Decimal Octal Format References
------- ----- ------ ----------
0 0 Reserved
1 1 raw internet [42]
2 2 TCP-3 [36]
3 3 DSP [37,38]
4 4 Gateway Monitoring Message [41]
5 5 TCP-3.1 [45]
6 6 TCP-4 [46]
7-254 7-376 Unassigned
255 377 ReservedASSIGNED INTERNET MESSAGE TYPES 🌸
In the March 1977 internetwork protocol [35], there's a field that identifies the type of the message 💖. That field is 4 bits in size 🫧.
Assigned Internet Message Types
Decimal Octal Type References
------- ----- ---- ----------
0 0 Raw Internet Packet
1 1 TCP-2 [35]
2 2 Secure
3 3 Gateway
4 4 Measurement
5 5 DSP [37,38]
6 6 UCL
7-12 7-14 Reserved
13 15 Pluribus
14 16 Telenet
15 17 XnetReferences ✨
okay bestie, here are all the receipts 📚💅 every single source, exactly as the original lists them 🫶
- [1] Feinler, E. "ARPANET Protocol Handbook," NIC 7104, Defense Communications Agency, January 1978.
- [2] BBN, "Specifications for the Interconnection of a Host and an IMP," Report 1822, Bolt Beranek and Newman, Cambridge, Massachusetts, January 1976.
- [3] McKenzie,A. "Host/Host Protocol for the ARPA Network," NIC 8246, January 1972. Also in [1].
- [4] Walden, D. " A System for Interprocess Communication in a Resource Sharing Network," RFC 62, NIC 4962, 3 August 1970. Also published in Communications of the ACM, volume 15, number 4, April 1972.
- [5] Bressler, B. "A Proposed Experiment with a Message Switching Protocol," RFC 333, NIC 9926, 15 May 72.
- [6] Postel, J. "Telnet Protocol," RFC 318, NIC 9348, 3 April 1972.
- [7] McKenzie, A. "File Transfer Protocol," RFC 454, NIC 14333, 16 February 1973.
- [8] Clements, R. "FTPSRV -- Extensions for Tenex Paged Files," RFC 683, NIC 32251, 3 April 1975. Also in [1].
- [9] Harvey, B. "One More Try on the FTP," RFC 691, NIC 32700, 6 June 1975.
- [10] Bressler, B. "Remote Job Entry Protocol," RFC 407, NIC 12112, 16 October 72. Also in [1].
- [11] Postel, J. "Echo Process," RFC 347, NIC 10426, 30 May 1972.
- [12] Postel, J. "Discard Process," RFC 348, NIC 10427, 30 May 1972.
- [13] Postel, J. "Character Generator Process," RFC 429, NIC 13281, 12 December 1972.
- [14] Neigus, N. "File Transfer Protocol," RFC 542, NIC 17759, 12 July 1973. Also in [1].
- [15] Postel, J. "Revised FTP Reply Codes," RFC 640, NIC 30843, 5 June 1974. Also in [1].
- [16] McKenzie, A. "Telnet Protocol Specification," NIC 18639, August 1973. Also in [1].
- [17] McKenzie, A. "Telnet Option Specification," NIC 18640, August 1973. Also in [1].
- [18] White, J. "A High Level Framework for Network-Based Resource Sharing," RFC 707, NIC 34263, 14 January 1976. Also in NCC Proceedings, AFIPS, June 1976.
- [19] White, J. "Elements of a Distributed Programming System," RFC 708, NIC 34353, 28 January 1976.
- [20] 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.
- [21] 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.
- [22] Harrenstien, K. "Time Server," RFC 738, NIC 42218, 31 October 1977. Also in [1].
- [23] Armenti, A., D. Hall, and A. Stone. "Lincoln Speech Data Facility," SUR Note 37, NIC 10917, 14 July 1972.
- [24] CCA, "Datacomputer Version 1 User Manual," Computer Corporation of America, August 1975.
- [25] Braden, R. "NETRJS Protocol," RFC 740, NIC 42423, 22 November 1977. Also in [1].
- [26] Sproull, R, and E. Thomas. "A Networks Graphics Protocol," NIC 24308, 16 August 1974. Also in [1].
- [27] Cerf, V., "NCP Statistics," RFC 388, NIC 11360, 23 August 1972.
- [28] Cerf, V., "Formation of a Network Measurement Group (NMG)," RFC 323, NIC 9630, 23 March 1972.
- [29] Bhushan, A., "A Report on the Survey Project," RFC 530, NIC 17375, 22 June 1973.
- [30] Cantor, D., "Storing Network Survey Data at the Datacomputer," RFC 565, NIC 18777, 28 August 1973.
- [31] Bressler, R., "Inter-Entity Communication -- An Experiment," RFC 441, NIC 13773, 19 January 1973.
- [32] Thomas, R. "A Resource Sharing Executive for the ARPANET," AFIPS Conference Proceedings, 42:155-163, NCC, 1973.
- [33] Crispin, M. "SUPDUP Protocol," RFC 734, NIC 41953, 7 October 1977. Also in [1].
- [34] Postel, J. "Official Initial Connection Protocol," NIC 7101, 11 June 1971. Also in [1].
- [35] Cerf, V. "Specification of Internet Transmission Control Program -- TCP (version 2)," March 1977.
- [36] Cerf, V. and J. Postel, "Specification of Internetwork Transmission Control Program -- TCP Version 3," USC-Information Sciences Institute, January 1978.
- [37] Reed, D. "Protocols for the LCS Network," Local Network Note 3, Laboratory for Computer Science, MIT, 29 November 1976.
- [38] Clark, D. "Revision of DSP Specification," Local Network Note 9, Laboratory for Computer Science, MIT, 17 June 1977.
- [39] 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 [1].
- [40] Harrenstien, K. "Name/Finger," RFC 742, NIC 42758, 30 December 1977. Also in [1].
- [41] Cole, J. "Gateway Monitoring Messages," BBN, 1 February 1978.
- [42] Postel, J. "Draft Internetwork Protocol Specification -- Version 2," USC-Information Sciences Institute, February 1978.
- [43] Cerf, V. "A Proposed New Internet Header Format," Advanced Research Projects Agency, IEN 26, 14 February 1978.
- [44] Postel, J. "Internetwork Protocol Specification -- Version 4," IEN-54, USC-Information Sciences Institute, September 1978.
- [45] Cerf, V. "A Proposal for TCP Version 3.1 Header Format," Advanced Research Projects Agency, IEN 26, 14 February 1978.
- [46] Postel, J. "Specification of Internetwork Transmission Control Protocol -- Version 4," IEN-55, USC-Information Sciences Institute, September 1978.
📦 where this page comes from
- ietf: rfc750 1978-09
- 💖 girlified by claude-haiku-5-5 on : a language model's rewrite of the original, under its terms