Every .dk domain that delegates its _acme-challenge name to f04cb465-9276-4ef9-864f-a4894dce68c4.auth.acme-challenge.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.