RFC 840 · HISTORIC · 1983
MON · 27 JUL 2026
Official protocols
Overview
RFC 840, “Official protocols”, is a Historic document published in April 1983 by J. Postel. It has been obsoleted by RFC 880 — refer to the newer document for the authoritative version. The canonical text is published by the RFC Editor.
Abstract
This RFC has been revised, see RFC 880.
What “Historic” means
A specification that has been superseded or is otherwise no longer recommended for use.
Read this RFC
The canonical text of RFC 840 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 1983
- RFC 839 Who talks TCP?
- RFC 841 Specification for message format for Computer Based Message Systems
- RFC 838 Who talks TCP?
- RFC 842 Who talks TCP? - survey of 1 February 83
- RFC 837 Who talks TCP?
- RFC 843 Who talks TCP? - survey of 8 February 83
- RFC 836 Who talks TCP?
- RFC 844 Who talks ICMP, too? - Survey of 18 February 1983