Every .dk domain that delegates its _acme-challenge name to cb7f108a-958a-4f74-a055-b77be2e04e2c.c-8a1f.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.