RFC 640 · UNKNOWN · 1974 MON · 14 SEP 2026

Revised FTP reply codes

By J. Postel · Published June 1974 · DOI 10.17487/RFC0640

Overview

RFC 640, “Revised FTP reply codes”, is an Unknown document published in June 1974 by J. Postel. It updates RFC 542. The canonical text is published by the RFC Editor.

Abstract

Updates RFC 542.

Abstract as published in the RFC, via rfc-editor.org.

What “Unknown” means

The standards-track status of this early RFC was never formally classified.

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Relationships to other RFCs
This RFC updates
RFC 542
Other RFCs from 1974