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Assigned numbers (RFC0820) Disclosure Number: IPCOM000003868D
Original Publication Date: 1982-Aug-14
Included in the Prior Art Database: 2000-Sep-13
Document File: 19 page(s) / 51K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Postel: AUTHOR



This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 5% of the total text.

Network Working Group J. Postel

Request for Comments: 820 J. Vernon

January 1983

Obsoletes RFCs: 790, 776, 770, 762,

758, 755, 750, 739, 604, 503, 433, 349

Obsoletes IENs: 127, 117, 93


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, subject to the agreement between

DARPA/IPTO and DDN/PMO about number allocation, documented in Appendix A

of this RFC. 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


The ARPANET community is making the transition form the ARPANET to the

ARPA Internet. This has been characterized as the NCP/TCP transition

[63], although many other the protocols are involved, too. The working

documents for the new Internet environment have been collected by the

Network Information Center (NIC) in a book entitled the "Internet

Protocol Transition Workbook" [62].

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 "Protocol

Handbook" [17] prepared by the NIC. Some of the items listed are


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.

RFC 820 January 1983

Assigned Numbers

Network Numbers


The network numbers listed here are used as internet addresses by the

Internet Protocol (IP) [33,62]. 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