RFC 687 · UNKNOWN · 1975
MON · 15 JUN 2026
IMP/Host and Host/IMP Protocol changes
Overview
RFC 687, “IMP/Host and Host/IMP Protocol changes”, is an Unknown document published in June 1975 by D.C. Walden. It has since been updated by RFC 690. It has been obsoleted by RFC 704 — refer to the newer document for the authoritative version. The canonical text is published by the RFC Editor.
Abstract
Addressing hosts on more than 63 IMPs, and other backwards compatible expansions; see also RFCs 690 and 692.
What “Unknown” means
The standards-track status of this early RFC was never formally classified.
Read this RFC
The canonical text of RFC 687 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 1975
- RFC 686 Leaving well enough alone
- RFC 688 Tentative schedule for the new Telnet implementation for the TIP
- RFC 685 Response time in cross network debugging
- RFC 689 Tenex NCP finite state machine for connections
- RFC 684 Commentary on procedure calling as a network protocol
- RFC 690 Comments on the proposed Host/IMP Protocol changes
- RFC 683 FTPSRV - Tenex extension for paged files
- RFC 691 One more try on the FTP