Cref.ru is tracked by us since October, 2012. Over the time it has been ranked as high as 896 999 in the world, while most of its traffic comes from Russian Federation, where it reached as high as 79 022 position. It was owned by several entities, from CREF-R to Chastnoe Uchrezhdenie Dopolnitelnogo Obrazovaniya "KREF", it was hosted by OVH SAS, Beget Ltd and others.

Cref has a decent Google pagerank and bad results in terms of Yandex topical citation index. We found that Cref.ru is poorly ‘socialized’ in respect to any social network. According to MyWot and Google safe browsing analytics, Cref.ru is quite a safe domain with mostly negative visitor reviews.