Every .dk domain that delegates its _acme-challenge name to 7b49d117-ae82-4acb-857b-0832f9e8bc1b.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.