| Domain Name | Reason |
| oh-a.com | prod < 20% |
| ohmature.com | hitbots (too much anonymous proxies) |
| ohmymoms.org | smart hitbots |
| olaporno.com | registers again and again after deletion and does not send traffic |
| oldermature.org | abusive traffic leecher |
| oldfathairyhoes.com | traffic leecher |
| oldladymovies.com | advanced hitbots |
| oldmatures.com | bad countries traffic |
| oldmoms.org | smart hitbots |
| oldpleasure.com | excessive popups |
| oldpornsite.info | hitbots |
| olegosfrenus.com | hitbots / opener / exploits |
| on-live-cams.com | exploit, opener, hibots |
| oneday-teens.com | hitbots |
| onesexzone.com | traffic leecher |
| oneteens.com | traffic leecher |
| only-eighteen.com | hitbots |
| only-toons.com | 75% hitbots |
| onlyfatchiks.com | opener |
| onlygreatpics.org | hitbots |
| onlyhotporn.net | domain belongs to confirmed cheater |
| onlypornoclips.com | opener |
| onlyteenstgp.com | lolita content, exploits |
| onlythumbteens.com | exploit |
| orangepics.net | hitbots |