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Internet numbers (RFC0997) Disclosure Number: IPCOM000004994D
Original Publication Date: 1987-Mar-01
Included in the Prior Art Database: 2019-Feb-14
Document File: 42 page(s) / 57K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J.K. Reynolds: AUTHOR [+1]

Related Documents

10.17487/RFC0997: DOI


This memo is an official status report on the network numbers used in the Internet community. As of 1-Mar-87 the Network Information Center (NIC) at SRI International has assumed responsibility for assignment of Network Numbers and Autonomous System Numbers. This RFC documents the current assignments of these numbers at the time of this transfer of responsibility. Obsoletes RFC-990, 960, 943, 923 and 900.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 4% of the total text.

Network Working Group J. Reynolds Request for Comments: 997 J. Postel ISI Obsoletes RFCs: 990, 960, 943, 923, 900, March 1987 870, 820, 790, 776, 770, 762, 758, 755, 750, 739, 604, 503, 433, 349 Obsoletes IENs: 127, 117, 93


Status of this Memo

This memo is an official status report on the network numbers used in the Internet community. Distribution of this memo is unlimited.


This Network Working Group Request for Comments documents the currently assigned network numbers and gateway autonomous systems. This RFC will be updated periodically, and in any case current information can be obtained from Hostmaster.

Hostmaster DDN Network Information Center SRI International 333 Ravenswood Avenue Menlo Park, California 94025

Phone: 1-800-235-3155


Most of the protocols used in the Internet are documented in the RFC series of notes. Some of the items listed are undocumented. Further information on protocols can be found in the memo "Official ARPA-Internet Protocols" [24]. The more prominent and more generally used are documented in the "DDN Protocol Handbook" [11] prepared by the NIC. Other collections of older or obsolete protocols are contained in the "Internet Protocol Transition Workbook" [12], or in the "ARPANET Protocol Transition Handbook" [13]. For further information on ordering the complete 1985 DDN Protocol Handbook, contact the Hostmaster.

In the entries below, the name and mailbox of the responsible individual is indicated. The bracketed entry, e.g., [nn,iii], at the right hand margin of the page indicates a reference for the listed protocol, where the number ("nn") cites the document and the letters ("iii") cites the person. Whenever possible, the letters are a NIC Ident as used in the WhoIs (NICNAME) service.

Reynolds & Postel [Page 1]

Internet Numbers RFC 997 Introduction

The convention in the documentation of Internet Protocols is to express numbers in decimal and to picture data in "big-endian" order [31]. That is, fields are described left to right, with the most significant octet on the left and the least significant octet on the right.

The order of transmission of the header and data described in this document is resolved to the octet level. Whenever a diagram shows a group of octets, the order of transmission of those octets is the normal order in which they are read in English. For example, in the following diagram the octets are transmitted in the order they are numbered.

0 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 1 | 2 | 3 | 4 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 5 | 6 | 7 | 8 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 9 | 10 | 11 | 12 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Transmission Order of Bytes

Whenever an octet represents a numeric quantity the left most bit in the diagram i...