RFC 204 · UNKNOWN · 1971
MON · 15 JUN 2026
Sockets in use
Overview
RFC 204, “Sockets in use”, is an Unknown document published in August 1971 by J. Postel. It has since been updated by RFC 234. The canonical text is published by the RFC Editor.
What “Unknown” means
The standards-track status of this early RFC was never formally classified.
Read this RFC
The canonical text of RFC 204 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 1971
- RFC 203 Achieving reliable communication
- RFC 205 NETCRT - a character display protocol
- RFC 202 Possible Deadlock in ICP
- RFC 206 A User TELNET Description of an Initial Implementation
- RFC 207 September Network Working Group meeting
- RFC 200 RFC list by number
- RFC 208 Address tables
- RFC 199 Suggestions for a Network Data-Tablet Graphics Protocol