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Assigned numbers (RFC0790) Disclosure Number: IPCOM000003839D
Original Publication Date: 1981-Sep-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 13 page(s) / 34K

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 8% of the total text.

Network Working Group J. Postel

Request for Comments: 790 ISI

September 1981

Obsoletes RFCs: 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. 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


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.

RFC 790 September 1981

Assigned Numbers

Network Numbers


This list of network numbers is used in the internet address [33].

The Internet Protocol (IP) uses a 32 bit address 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, or class a, of address has a 7-bit network number

and a 24-bit local address. This allows 128 class a networks.

1 2 3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1


|0| NETWORK | Local Address |


Class A Address

The second type, or class b, of address has a 14-bit network

number and a 16-bit loca...