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Assigned numbers (RFC0739) Disclosure Number: IPCOM000003786D
Original Publication Date: 1977-Nov-01
Included in the Prior Art Database: 2019-Feb-14
Document File: 11 page(s) / 11K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Postel: AUTHOR

Related Documents

10.17487/RFC0739: DOI

This text was extracted from a PDF file.
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NWG/RFC# 739 JBP 11 Nov 77 42341 Assigned Numbers

Network Working Group J. Postel Request for Comments: 739 USC-ISI NIC: 42341 11 November 1977


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, etc. 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


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 [1] prepared by the Network Information Center (NIC). In the lists that follow a bracketed number, e.g. [1], off to the right of the page indicates a reference to the protocol assigned that number.

[Page 1]

NWG/RFC# 739 JBP 11 Nov 77 42341 Assigned Numbers 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 [2].

Link Assignments:

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] 159-191 237-277 Measurements [28] 192-195 300-303 Message Switching Protocol [4,5] 196-255 304-377 Experimental Protocols

[Page 2]

NWG/RFC# 739 JBP 11 Nov 77 42341 Assigned Numbers Assigned Socket Numbers


Sockets are used in the AHHP [1,3] to name the ends of logical connections which carry long term conversations. For the purpose of providing services to all callers an Initial Connection Procedure ICP [1,34] is used between the user process and the server process. This list specifies the socket used by the server process 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 Experimenta...