Every .dk domain that delegates its _acme-challenge name to b5b2bb6f-3729-4273-9cf2-d7a72e858212.3.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.