Atc21s.org is tracked by us since May, 2012. Over the time it has been ranked as high as 2 276 399 in the world, while most of its traffic comes from USA, where it reached as high as 1 723 888 position. It was owned by several entities, from Frank D'Andrea of The University of Melbourne to Domain Registrant of The University of Melbourne, it was hosted by Opus Interactive, CloudFlare Inc. and others.

Atc21s has a high Google pagerank and bad results in terms of Yandex topical citation index. We found that Atc21s.org is poorly ‘socialized’ in respect to any social network. According to Siteadvisor and Google safe browsing analytics, Atc21s.org is quite a safe domain with no visitor reviews.