In the back scenes, Kentik's OTT Service Tracking workflow leverages an engine, aptly named True Origin. This engine correlates DNS Query/Response data with network telemetry to provide a scalable, affordable DPI-lite type of service.
You can learn more about it here.

While this is something that we rarely spend time talking about, our OTT detection engine, a broadband provider’s favorite, keeps on learning and evolving as time goes by, and the amount of DNS hostname patterns that it is able to detect the underlying service for keeps on increasing constantly.

Over the month of October 2021, the True Origin engine has learned to classify an additional ~1,000 new hostname patterns to match flow with DNS queries. This month, its improvements were centered around Vietnam, Denmark, Sweden and Germany.