Every .dk domain that delegates its _acme-challenge name to 0e864e9d-2ebd-463c-920b-0d9ce5a0b586.c-4430.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.