RFC 777 · UNKNOWN · 1981
MON · 27 JUL 2026
Internet Control Message Protocol
Overview
RFC 777, “Internet Control Message Protocol”, is an Unknown document published in April 1981 by J. Postel. It updates RFC 760. It has been obsoleted by RFC 792 — refer to the newer document for the authoritative version. 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 777 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 1981
- RFC 776 Assigned numbers
- RFC 778 DCNET Internet Clock Service
- RFC 779 Telnet send-location option
- RFC 780 Mail Transfer Protocol
- RFC 781 Specification of the Internet Protocol timestamp option
- RFC 782 Virtual Terminal management model
- RFC 783 TFTP Protocol
- RFC 784 Mail Transfer Protocol: ISI TOPS20 implementation