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| Top Mud Sites - MUD Listing | MUD Search |
| MUD Name | MUD Address | Codebase | Location | Homepage | Current Rank |
| New Horizons | www.horizonz.co.uk:1234 | DikuMUD | United Kingdom |  |
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| New Moon | eclipse.cs.pdx.edu:7680 | Lp MUD | USA | |
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| NibbleMUD | nibblemud.com:7000 | CircleMUD | USA | |
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| Night of the Everlasting | asgard2.inetsolve.com:6000 | ROT | USA | - | |
| Night Shade | nightshade.dk:9000 | ROM | USA | |
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| Nightmare LPMud | nightmare.imaginary.com:1701 | Lp MUD | USA | |
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| NightMarket MUSH | NightMarket.Pennmush.org:4201 | MUSH | Canada | |
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| Nightmist Online | www.nightmistonline.com:80 | Unique | United Kingdom | |
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| Nights Asunder 2: Shades of the Past | kaerlath.genesismuds.com:9969 | Godwars | USA | |
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| Nightshade - The Bane of Boredom | Nightshade.vester.dk:8000 | ROM | Denmark | - | |
| Nightside: Commanders Of War | N/a:0 | Custom | Nightsi.de | |
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| Nijigen - The Other World | http://ac3.metawerx.net:0 | Custom | USA | |
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| Nilarden | mythicpk.homedns.org:9010 | Custom | USA | - | |
| Nilgiri, The Forgotten World | nilgiri.mythril.com:8888 | DikuMUD | USA | |
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| Nirvana | nirvana.beanos.com:3500 | Lp MUD | USA | |
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| NirvanaMUD | mud.nlink.com.br:3000 | CirceMUD | Brazil | - | |
| Njata | njatamud.com:6500 | Smaug | USA | |
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| No Man's Land | 63.162.239.68:5001 | Lp MUD | Norway | |
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| No Return | noreturn.closetgamers.com:2250 | PennMUSH | New York | |
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| NobleMUSH | csmctmto.netside.net:4664 | TinyMUSH | USA | - | |
| Nocturnal Mysts | mysts.legendarybeginnings.net:2004 | Unique | Canada | |
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| Nodeka | nodeka.com:23 | Custom | USA | |
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| Noirea | - | Custom | USA | |
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| NorCon MUSH | 216.136.9.21:4210 | MUSH | United States | |
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| Northern Crossroads | ncmud.net:9000 | DikuMUD | Canada | |
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| Northern Lights Mud | tamarisk.ab.ca:2222 | DikuMUD | Canada | |
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| Nuclearwar Mud | nuke.powerstrugglemud.com:4080 | Custom | USA | - | |
| Nuevia | telnet nueviamud.no-ip.org:5555 | CoffeeMUD | Michigan | |
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| Obirod 2 | slayn.net:6666 | Lp MUD | USA | |
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| Oblivion: Destiny's End | oblivionmud.org:3003 | DikuMUD | USA | |
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| OceanCrest | falconcrest.yi.org:4040 | Mordor | USA | |
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| One Percent | 1mud.org:9000 | ROM | USA | - | |
| Online Gaming Resource | ogrmush.com:6700 | TinyMUSH | USA | |
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| Online Roleplay Resource Center | http://www.onlineroleplay.com:0 | Custom | USA | |
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| Onslaught:EoC | bb1.betterbox.net:5500 | CircleMUD | USA | |
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| OracleBBS | oraclebbs.com:23 | Unique | USA | - | |
| Organelle | organelle.org:4045 | Custom | USA | |
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| Otherworld the land of Tirn Aill | tirnaill.com:4000 | CircleMUD | USA | |
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| Ouroboros MUD | ouroboros.mudplace.org:8000 | ROM | USA | |
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| OurPlace Mud | ourplace.org:6543 | Envy | USA | |
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| Out of Darkness | 12.171.188.40:4040 | Godwars | USA | |
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| Out of Time | - | MUX | Sweden | - | |
| Outer Realms | cyrus.mudhaven.com:4321 | Unique | USA | - | |
| Outlands | theoutlands.net:4444 | ROM | Not Listed Here | |
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| Outlands - 4th Age | void.dune.net:3000 | ROM | USA | |
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| OutlandsMud | outlandsmud.com:4000 | DikuMUD | USA | |
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| Outpost Station | the-edge.dynip.com:6666 | PennMUSH | USA | - | |
| Outreach | 209.123.65.13:6969 | TinyMUSH | USA | |
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| Outremer | outremermux.org:4321 | MUX | USA | |
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| Overdrive | overdrive.overdrivemud.net:5195 | Lp MUD | USA | |
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