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| name | tag | full name | site | registration | |
|---|---|---|---|---|---|
 | OZTSK | =[TSK]= | Türk Silahlı Kuvvetleri | tsk.gov.tr | 10 years |
| OZB0V | b0v. | blade of vengeance | 10 years | ||
| OYA | *oYa* | Ownage Your Ass | 14 years | ||
| OXYGENE | .O2` | .Oxygène` | 12 years | ||
| OXYGAMING | Oxy| | oxy-gamiing.xooit.fr | 10 years | ||
| OXID | [OXID] | OXID Gaming | OXID.us | 6 years | |
| OWP | owp. | Own peace | 11 years | ||
| OWNEDC0 | -ow. | owned | 9 years | ||
 | OWN | Online Warrior Nation | wix.com | 12 years | |
| OWLS | )O,O( | Owltribe | owltribe.iourt.com | 11 years | |
| OWARTS | owarts. | Owarts | 9 years | ||
 | OVERPOWERED | OP| | OVERPOWERED | 2 months | |
| OVERLORD | maiN. | 9 years | |||
| OVERDRIVE | [ODv] | Overdrive Clan | 6 years | ||
| OVERDOSE | [O] | Overdose team. | 10 years | ||
| OUTTA | outta. | Outta Control | outta-control.enjin.com | 11 years | |
| OUTLAWS | The Army Of Thieves | 9 years | |||
 | OUTLAW | ouTlaw][ | ouTlaw Promotion | outlaw-promotion.de | 14 years |
| OTTO | [OTTO] | Otto-Clan | clan.ottoscreen.de | 14 years | |
| OTS | OtS|* | ONLY TEAM SURVIVOR | otsclanurt.es.tl | 14 years | |
 | OSS | [OSS] | Occulti Super Sovrani | oss.netsons.org | 14 years |
| ORIGIN | ORiGiNAL | 11 years | |||
 | ORDER66 | #O/66! | Order 66 | order66.net.tc | 14 years |
 | OR1G1N | [ORiGiN] | ORiGiNAL | 11 years | |
| OPX10 | Opal Core Op10 | 11 years |
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