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| name | tag | full name | site | registration | |
|---|---|---|---|---|---|
 | OPS | -|OPS|- | Ops Clan | mushcraft.enjin.com | 12 years |
 | OPPRESSION | opp. | Oppression | team-opp.com | 14 years |
| OPPOSITES | .:[O]:. | OPPOSITES | 12 years | ||
| OPP | .opp. | Oppression | 10 years | ||
 | ONTOP | ontop. | ontop gaming | orks.fr | 11 years |
| ONOFF | |O_o| | On_off | oo-team.eu | 14 years | |
 | ONIICHAN | Kawaii. | お兄ちゃん | 3 years | |
| ONI | Oni- | Oni | 7 years | ||
| ONFIRE | oF` | oF | 10 years | ||
| ONEROAD | [O]R| | One*Road | 10 years | ||
| ONEONETHREE | 113| | 113 | 5 years | ||
| ONEHW | 1hW| | One Hit Wonders | onehitwonders.shivtr.com | 10 years | |
| ONEARM | [oneArm] | 14 years | |||
| ONAIR | -On.aiR- | On.aiR | onair-clan.enjin.com | 14 years | |
| OMMU | |OMMU| | OMMU | 12 years | ||
| OM3GA | {Om3ga} | Om3ga | 13 years | ||
| OLS | {LS} | OurLastStand | ourlaststand.boards.net | 9 years | |
| OLDTEAM | old. | bunkeror | 9 years | ||
| OLDSCHOOL | Os| | Old School | 6 years | ||
| OLD | Old| | Old School | 10 years | ||
 | OK | oK| | oKay Clan | okgam3r.com | 13 years |
| OGO | oG! | Online Gangsta Organization | ogo.urtclan.net | 13 years | |
| OFFICIALFBI | [FBI] | Female Body Inspectors | 8 years | ||
| ODARY | [odc] | Odary | 11 years | ||
| OC | 14 years |
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