Every .dk domain that delegates its _acme-challenge name to 0aa4f190-46c2-47a7-a82c-5e77d69e854f.6.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.