Every .dk domain that delegates its _acme-challenge name to 32996f4e-a309-467a-84b6-d40de1ced064.19.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.