Ck12.org is tracked by us since May, 2012. Over the time it has been ranked as high as 1 499 in the world, while most of its traffic comes from USA, where it reached as high as 337 position. Flexbooks.ck12.org receives about 40.27% of its total traffic. It was hosted by Amazon.com Inc., Amazon.com Inc. and others.

Flexbooks.ck12 has the lowest Google pagerank and bad results in terms of Yandex topical citation index. We found that Flexbooks.ck12.org is poorly ‘socialized’ in respect to any social network. According to MyWot, Siteadvisor and Google safe browsing analytics, Flexbooks.ck12.org is quite a safe domain with no visitor reviews.