Every .dk domain that delegates its _acme-challenge name to ae9e7fe4-9f52-451a-8b54-72ed487e0899.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.