RFC 839 · UNKNOWN · 1983
MON · 15 JUN 2026
Who talks TCP?
Overview
RFC 839, “Who talks TCP?”, is an Unknown document published in January 1983 by D. Smallberg. It obsoletes RFC 838. It has been obsoleted by RFC 842 — refer to the newer document for the authoritative version. The canonical text is published by the RFC Editor.
Abstract
This RFC is a survey of hosts to identify the implementation status of Telnet, FTP, and Mail on TCP. The list of hosts was taken from the NIC hostname table of 31-Dec-82. The tests were run on 25-Jan-83.
What “Unknown” means
The standards-track status of this early RFC was never formally classified.
Read this RFC
The canonical text of RFC 839 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 1983
- RFC 838 Who talks TCP?
- RFC 840 Official protocols
- RFC 837 Who talks TCP?
- RFC 841 Specification for message format for Computer Based Message Systems
- RFC 836 Who talks TCP?
- RFC 842 Who talks TCP? - survey of 1 February 83
- RFC 843 Who talks TCP? - survey of 8 February 83
- RFC 844 Who talks ICMP, too? - Survey of 18 February 1983