Every .dk domain that delegates its _acme-challenge name to 0f7d1582-51d7-47ea-8e49-e8f05e773fa0.10.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.