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| name | tag | full name | site | registration | |
|---|---|---|---|---|---|
| UND | ]_[ | Underscore | 14 years | ||
| UNION | -UoR- | Union of Revolution | uor.xooit.fr | 13 years | |
| UNIQUE | |UiQ{ | UniQue Clan | 12 years | ||
| UNITED5 | UNITED| | United 5 | urban-zone.org | 9 years | |
| UNITEDADMINS | United Admins (Team Infinity) | 9 years | |||
 | UAE | United Arab Emirates | 11 years | ||
| UNITED | `uP | United Pangaea | 12 years | ||
| UPF | ={UPF}= | United Pro Fraggers | 13 years | ||
| USMAFIA | US.Mafia | United States Mafia | 13 years | ||
| UTF | ]UTF[ | United Tux for Freedom | 13 years | ||
| UWR | United Warriors | 13 years | |||
| UNITH | uNith. | uNith Clan | 11 years | ||
| UWP | [UWP] | University of Wisconsin Plattevi | 14 years | ||
| UNKBR | |<O>| | unKnow | unkurt.forumeiros.com | 10 years | |
| UNR | unR| | unRestricted E-Sports | unrestricted-esports.com | 13 years | |
| UPCCLAN | =UPC= | UPC Clan | upcclan.com | 13 years | |
| UPTOTHETOP | U3T* | UpToTheTop | 9 years | ||
| UCC | [UCC] | Urban Clan Cup | urban-clan-cup.fr | 13 years | |
| UEP | Urban Epic Players | 13 years | |||
| URM | |UrM.| | Urban Mafia | urm-clan.forumotion.com | 12 years | |
| URMIL | [U-M] | Urban Militia | urban-militia.webb-jack.com | 12 years | |
| URBANPT | URBAN PORTUGAL | 14 years | |||
 | URD | |URD|# | Urban RubberDucks | 14 years | |
| UTSL | USL- | Urban Stars League | wit | 10 years | |
| URTBH | Bh|| | Urban Terror Brotherhood | urt-bh.superforo.net | 12 years |
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