Every .dk domain that delegates its _acme-challenge name to eb93c6d9-9719-423e-a1fe-713d6f217e6f.auth.acme-challenge.dk. 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.