Player-session MUD protocol

MCCP1

MUD Client Compression Protocol v1

Legacy compatibility Not in common current use Legacy

The original server-to-client compression protocol, later replaced by MCCP2.

Protocol overview

First seen: 1998
Present-day status: Legacy compatibility
In use today?: No common current use was verified.
Legacy?: Yes. It may still matter for compatibility or historical systems.
Layer: Player-session MUD protocol
Transport: Early Telnet compression convention using zlib
Research validated: 2026-08-29

Current use and fit

Retained only for specific old clients and historical implementations.

Implementation essentials

Implement MCCP2 for new work.
Keep v1 compatibility isolated if an existing audience requires it.

Compatibility and safety notes

Do not treat compression as encryption.
Do not assume MCCP generations share one wire format.

Original specifications and sources

MUDhalla MCCP family specification Primary

Where an original site has disappeared, a preservation archive is linked and identified as such. MUDVerse does not claim authorship of the original protocol.