google.app is an ad exchange. That means they work as a middleman between advertisers who buy ad space and publishers who sell ad space. google.app has been authorized to sell the ad space on 3 publisher domains. You can view these domains below.
0% of the publishers we track have authorized google.app. google.app's certificate ID is
f08c47fec0942fa0. 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.