RFC 666 · UNKNOWN · 1974
MON · 15 JUN 2026
Specification of the Unified User-Level Protocol
Overview
RFC 666, “Specification of the Unified User-Level Protocol”, is an Unknown document published in November 1974 by M.A. Padlipsky. The canonical text is published by the RFC Editor.
Abstract
Discusses and proposes a common command language.
What “Unknown” means
The standards-track status of this early RFC was never formally classified.
Read this RFC
The canonical text of RFC 666 is hosted at rfc-editor.org. Available in TXT,HTML.
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- RFC 661 Protocol information
- RFC 671 Note on Reconnection Protocol
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