test.datasign.jp is an ad exchange. That means they work as a middleman between advertisers who buy ad space and publishers who sell ad space. test.datasign.jp has been authorized to sell the ad space on 1 publisher domains. You can view these domains below.
0% of the publishers we track have authorized test.datasign.jp. test.datasign.jp's certificate ID is
6a698e2ec38604c6. Verify here .
This information is gathered by crawling ads.txt files on millions of websites. Ads.txt is an initiative developed by Google, the IAB and others to fight ad fraud.