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| name | tag | full name | site | registration | |
|---|---|---|---|---|---|
| URBANKICKR | 14 years | ||||
| UNC | 14 years | ||||
| URBANNOOBZ | 14 years | ||||
| ULTIMATE | Ultimate Power | 14 years | |||
| UPC | 14 years | ||||
 | URD | |URD|# | Urban RubberDucks | 14 years | |
| UNLIMITED | 14 years | ||||
| UFP | 14 years | ||||
| UWP | [UWP] | University of Wisconsin Plattevi | 14 years | ||
| UMR | |UMR| | After Lab | 14 years | ||
| UND | ]_[ | Underscore | 14 years | ||
| UFO | *Ufo* | the Ufo yeah yeah ! | 14 years | ||
| URBANPT | URBAN PORTUGAL | 14 years | |||
| UPTOWN | 14 years | ||||
| UDA | 14 years | ||||
| US | 14 years | ||||
| UNBALAN | No Longer Used | 14 years |
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