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Socket number list (RFC0503) Disclosure Number: IPCOM000004932D
Original Publication Date: 1973-Apr-01
Included in the Prior Art Database: 2019-Feb-12
Document File: 8 page(s) / 7K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

N. Neigus: AUTHOR [+1]

Related Documents

10.17487/RFC0503: DOI

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 49% of the total text.

Network Working Group N. Neigus Request for Comments: 503 J. Postel NIC: 15747 13 April 1973 References: 349, 433

Socket Number List

This is a second pass at the specification of the socket numbers. More sockets have been made available for experimental functions, some new sockets have been assigned for network standard functions, host specific functions and experimental functions, and the list of available sockets for server hosts has been updated.

Following are the current assignments for socket numbers used for public functions. Note that a socket number is a 40 bit quantity, the first 8 bits being the host specification, the next 24 bits being site specific, and the last 8 bits being user specified -- these last 8 bits are called the AEN [it stands for, cleverly enough, Another Eightbit Number].

For the assignments here the value in the host field ranges across al hosts (unless otherwise specified), the value in the 24 bit field is zero, and the AEN is indicated here.

General Assignments:

Sockets Assignment

0 - 63 Network Wide Standard Functions 64 - 127 Host Specific Functions 128 - 223 Reserved for Future Use 224 - 255 Any Experimental Function

Neigus, et. al. [Page 1]

RFC 503 Socket Number List 13 April 1973

Particular Assignments:

Socket Assignment

1 Telnet 3 File Transfer 5 Remote Job Entry 7 Echo 9 Discard 11 Systat or who-is-on function 13 Date-Time function 15 Netstat or who-is-up function 19 Character Generator [e.g. TTYTST]

65 Speech Data Base @ 11-tx-2 (74) 67 69 CPYNET 71 NETRJS [EBCDIC] 73 NETRJS [ASCII] 75 NETRJS [TTY]

241 NCP Measurement 243 Survey Measurement 245 LINK 247 RSEXEC 249 RSEXEC 251 RSEXEC

The specifications for the assigned functions can be found in the documents listed here:

Telnet NIC 7104 File Transfer NIC 7104 Remote Job Entry NIC 7104 Echo RFC 347 Discard RFC 348 Character Generator RFC 429 Speech Data Base SUR 37 Datacomputer [Murray @ CCA] NCP Measurement RFC 388 Survey Data [Kampa @ NMC] LINK [Bressler @ BBN] RSEXEC [Thomas @ BBN]

There are several hosts performing public services on sockets which conflict with the above scheme. We hope we can resolve these conflicts with a minimum of disruption.

Neigus, et. al. [Page 2]

RFC 503 Socket Number List 13 April 1973

The following is a tabulation of socket numbers together with the services offered. This listing is presented as an aid to network users. If you know of a socket function which has been left out or an entry which should be corrected or deleted please contact:

Jon Postel 3804 Boelter Hall Computer Science Department University of California Los Angeles, CA. 90024

Phone: (213) 825-2368

NIC Ident - JBP


Nancy J. Neigus Bolt Beranek and Newman 50 Moulton Street Cambridge, Mass. 02138

Phone: (617) 661-0100

NIC Ident = NJN

We will be pleased to include socket/function information for other than "official" sockets [e.g. Tip News].


1 Telnet 3 File Transfer 241 NCP Measurement 243 Survey Data


1 Telnet 3 File Transfer 7 Echo 11 SYSTA...