Every .dk domain that delegates its _acme-challenge name to f3119999-9c08-42e3-92e6-47e2a5acca44.5.authorize.certificatemanager.goog. Such CNAMEs hand DNS-01 certificate validation to a shared service, so this list shows who issues TLS certificates through it. Data comes from our own scanners, which re-resolve every .dk domain in the zone roughly once a week.