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| Top Mud Sites - MUD Listing | MUD Search |
| MUD Name | MUD Address | Codebase | Location | Homepage | Current Rank |
| Insymnia | insymnia.com:6600 | CircleMUD | US |  |
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| Into the Black | objectsinspace.com:2517 | MUSH | USA | |
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| IntrepidMUD | mud.intrepidmud.com:8400 | CirceMUD | USA | |
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| Ironclaw Online | ironclaw.skotos.net:443 | Lp MUD | America | |
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| Isengard | isengard.nazgul.com:4040 | Mordor | USA | |
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| Ishar | ishar.com:9999 | Custom | USA | |
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| Islands of Exile | mud.iflipout.com:5588 | ROM | USA | - | |
| Isle of War | iowar.org:5555 | ROM | USA | |
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| Isles of Aedin | game.islesofaedin.com:40001 | Custom | Virginia | |
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| Istari | istari.mud-dns.com:8990 | Lp MUD | United Kingdom | |
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| Ivalice | ivalicemud.com:6712 | ROM | USA | |
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| Jaida | messiah.ath.cx:6669 | DikuMUD | United Kingdom | - | |
| JediMUD | jedimud.com:4000 | DikuMUD | USA | |
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| Jellybean II | saturn.planetmud.com:4050 | Smaug | USA | |
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| JMUD | judgement.dyn.dhs.org:7250 | Smaug | Not Listed Here | |
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| Jointhesaga.com | jointhesaga.com:1790 | MUSH | USA | |
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| Jotopia | jotopia.game-host.org:4000 | ROM | Canada | |
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| Judge Dredd MUX | freemux.wox.org:2469 | MUX | USA | |
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| Judgement Eyes | amaroq.org:5000 | Smaug | USA | |
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| Kalan: Cry of the People | Dont Have One Yet:2001 | Smaug | USA | |
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| KaosWars | kaoswars.cjb.net:7000 | Godwars | Canada | |
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| Kara's Storm | karastorm.org:4000 | Smaug | USA | |
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| Katsu-MUD | katsu-mud.marauderer.net:8008 | Custom | Australia | |
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| Kharisgon | mudhost.com:4200 | ROM | USA | |
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| Khrooon | mud.khrooon.net:4000 | ROM | Spain | |
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| Kindred | kindred.terrabox.com:7000 | Smaug | USA | |
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| Kindred of the East | wanderers.inetsolve.com:3501 | Godwars | USA | - | |
| Kindred Spirits | kindredspiritsmud.com:6767 | ROT | USA | |
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| Kingdom of Heroes | - | Custom | United Kingdom | |
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| Kingdom of Heroes | - | Custom | United Kingdom | |
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| Kingdoms | kingdoms.se:1812 | Lp MUD | Sweden | |
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| Kingdoms of the Lost | kotl.org:2222 | ROM | USA | |
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| Kinslayer - A Wheel of Time MUD | www.kinslayermud.org:2222 | CircleMUD | USA | |
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| Kirozia | 216.100.130.9:9000 | ROM | USA | |
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| Kituwah | http://kituwah.hopto.org:23 | Custom | USA | |
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| Kituwah Reborn | http://kituwah.hopto.org:2593 | Not Listed Here | US | |
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| Kivekian Dawn | kivekia.betterbox.net:4321 | DikuMUD | USA | |
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| Knights of Darkness | knights.wolfpaw.net:5555 | Star Wars Reality | USA | |
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| Knights of the Republic | 195.38.2.205:9900 | Star Wars Reality | USA | - | |
| Knossos - The Calling | 62.49.30.230:4343 | Custom | United Kingdom | |
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| KoBra MUD | kobramud.org:23 | Lp MUD | Netherlands | |
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| Kombat Mud | Kombatmud.com:6969 | CirceMUD | USA | |
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| KorongilMUSH | mush.korongil.org:6250 | PennMUSH | USA | |
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| Kushiel's Debut | kushielsdebut.org:2009 | MUX | USA | |
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| Lace of Ages | loa.slayn.net:9000 | ROM | USA | - | |
| Lakes of Darkness | lakes.multiuser.net:2345 | DikuMUD | USA | - | |
| Lance | lance.wolfpaw.net:8600 | Merc | USA | |
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| Land of Chaos | bb14.betterbox.net:9500 | Godwars | USA | |
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| Land of Legends | tcdbbs.zapto.org:4000 | Smaug | Glade Spring, VA, USA | |
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| Land of Neverending War | fleamuds.fr.cr:4500 | Merc | France | |
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