Every .dk domain that delegates its _acme-challenge name to 4fc2de92-5cc5-4fa8-81c1-24f15ba8f13b.certauth.wizkids.dk. 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.