RFC 638 · UNKNOWN · 1974
MON · 15 JUN 2026
IMP/TIP preventive maintenance schedule
Overview
RFC 638, “IMP/TIP preventive maintenance schedule”, is an Unknown document published in April 1974 by A.M. McKenzie. It obsoletes RFC 633. The canonical text is published by the RFC Editor.
Abstract
Corrects RFC 633.
What “Unknown” means
The standards-track status of this early RFC was never formally classified.
Read this RFC
The canonical text of RFC 638 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 1974
- RFC 637 Change of network address for SU-DSL
- RFC 636 TIP/Tenex reliability improvements
- RFC 640 Revised FTP reply codes
- RFC 635 Assessment of ARPANET protocols
- RFC 634 Change in network address for Haskins Lab
- RFC 642 Ready line philosophy and implementation
- RFC 633 IMP/TIP preventive maintenance schedule
- RFC 643 Network Debugging Protocol