Every .dk domain that delegates its _acme-challenge name to 45c8af99-7da8-4a67-ba9d-84a94c930ca4.acme.aau.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.