Every .dk domain that delegates its _acme-challenge name to 37958f7f-dcb5-4f7b-b91e-efb7f98fc574.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.