Every .dk domain that delegates its _acme-challenge name to eb2a9f2c-0b7e-4739-bb84-af2c62467b6e.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.