Every .dk domain that delegates its _acme-challenge name to fe4e87e9-c088-47c1-878e-a1f3a5641950.auth.acme-dns.io. 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.