It's listed all over...
[quote="SlothMUD Homepage":6x9e4cg6]To connect to SlothMUD III (slothmud.org port:6101 - 69.64.36.225:6101), click on the "Play SlothMUD" link on the top left of the page.[/quote:6x9e4cg6]
[quote="Play SlothMUD Link":6x9e4cg6]You have clicked the Telnet Link for the mud SlothMUD III, located at
telnet://slothmud.org:6101.[/quote:6x9e4cg6]
[quote="Mudconnector":6x9e4cg6]SlothMUD III
TMC Ranking: 1
Last Updated: June 14, 2004
Mud Created: January, 1989
Code Base: Dikumud Heavily Modified
Site: slothmud.org 6101 [69.64.36.225][/quote:6x9e4cg6]
Since you can't connect without knowing the correct port, any mud will make sure that the port number is included in any direct link to the mud and that it's fairly obvious if it's referred to in a text context. Look around for half a second and you're almost sure to find it.