Every .dk domain that delegates its _acme-challenge name to 7a5eebdf-6e4e-4da1-a8a5-d4f82dbd38fe.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.