Pro4.us is tracked by us since April, 2011. Over the time it has been ranked as high as 818 999 in the world, while most of its traffic comes from USA, where it reached as high as 207 365 position. It was owned by several entities, from PRO Insurance Managers Inc. of Pro Insurance Managers Inc. to Domain Admins of Arthur J. Gallagher & Co., it was hosted by Concentric, Incapsula Inc and others. While NEUSTAR INC. was its first registrar, now it is moved to .

Pro4 has a decent Google pagerank and bad results in terms of Yandex topical citation index. We found that Pro4.us is poorly ‘socialized’ in respect to any social network. According to Google safe browsing analytics, Pro4.us is quite a safe domain with no visitor reviews.