Every .dk domain that delegates its _acme-challenge name to 123cf7c6-cd21-4d72-a219-4a32fc7ad73d.9.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.