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| name | tag | full name | site | registration | |
|---|---|---|---|---|---|
 | O1BR | o1` | ONLY Team | 8 years | |
| OTS | OtS|* | ONLY TEAM SURVIVOR | otsclanurt.es.tl | 14 years | |
 | ONTOP | ontop. | ontop gaming | orks.fr | 11 years |
| ONOFF | |O_o| | On_off | oo-team.eu | 14 years | |
| OPX10 | Opal Core Op10 | 11 years | |||
| OPPOSITES | .:[O]:. | OPPOSITES | 12 years | ||
| OPP | .opp. | Oppression | 10 years | ||
 | OPPRESSION | opp. | Oppression | team-opp.com | 14 years |
 | OPS | -|OPS|- | Ops Clan | mushcraft.enjin.com | 12 years |
 | ORDER66 | #O/66! | Order 66 | order66.net.tc | 14 years |
 | OR1G1N | [ORiGiN] | ORiGiNAL | 11 years | |
| ORIGIN | ORiGiNAL | 11 years | |||
| OTTO | [OTTO] | Otto-Clan | clan.ottoscreen.de | 14 years | |
| OLS | {LS} | OurLastStand | ourlaststand.boards.net | 9 years | |
| O2C | #o2c` | Out Of Control | o2c-urt.eu | 8 years | |
| O0R | o0r! | Out Of Reality | o0r.pl | 11 years | |
 | OUTLAW | ouTlaw][ | ouTlaw Promotion | outlaw-promotion.de | 14 years |
| OUTTA | outta. | Outta Control | outta-control.enjin.com | 11 years | |
| OVERDOSE | [O] | Overdose team. | 10 years | ||
| OVERDRIVE | [ODv] | Overdrive Clan | 6 years | ||
 | OVERPOWERED | OP| | OVERPOWERED | 2 months | |
| OWARTS | owarts. | Owarts | 9 years | ||
| OWLS | )O,O( | Owltribe | owltribe.iourt.com | 11 years | |
| OWP | owp. | Own peace | 11 years | ||
| OYA | *oYa* | Ownage Your Ass | 14 years |
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