Every .dk domain that delegates its _acme-challenge name to 2de5dba0-2f4b-444f-9367-25ad3d0691fb.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.