Every .dk domain that delegates its _acme-challenge name to c7c0d82b-6c7e-425c-8568-c2aa2f8a447c.c-699b.tx.auth.certifytheweb.com. 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.