Every .dk domain that delegates its _acme-challenge name to d7de1223-3a38-4262-98fc-8be7b5f9be10.c-14d.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.