Every .dk domain that delegates its _acme-challenge name to 2f7bd158-efa2-45dd-a510-4a37118920f6.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.