Every .dk domain that delegates its _acme-challenge name to 6b679d76-159f-4ea0-9d77-c38c27d1a651.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.