RFC 991 · UNKNOWN · 1986
MON · 27 JUL 2026
Official ARPA-Internet protocols
Overview
RFC 991, “Official ARPA-Internet protocols”, is an Unknown document published in November 1986 by J.K. Reynolds, J. Postel. It obsoletes RFC 961. It has been obsoleted by RFC 1011 — refer to the newer document for the authoritative version. The canonical text is published by the RFC Editor.
Abstract
This RFC identifies the documents specifying the official protocols used in the Internet. Comments indicate any revisions or changes planned. This memo is an official status report on the numbers used in protocols in the ARPA-Internet community. Obsoletes RFC-961, 944 and 924.
What “Unknown” means
The standards-track status of this early RFC was never formally classified.
Read this RFC
The canonical text of RFC 991 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 1986
- RFC 990 Assigned numbers
- RFC 992 On communication support for fault tolerant process groups
- RFC 993 PCMAIL: A distributed mail system for personal computers
- RFC 988 Host extensions for IP multicasting
- RFC 994 Final text of DIS 8473, Protocol for Providing the Connectionless- mode Network Service
- RFC 987 Mapping between X.400 and RFC 822
- RFC 995 End System to Intermediate System Routing Exchange Protocol for use in conjunction with ISO 8473
- RFC 986 Guidelines for the use of Internet-IP addresses in the ISO Connectionless-Mode Network Protocol