Every .dk domain that delegates its _acme-challenge name to 6d8dd90e7b5f951f9dd7d0eae6fc73a3.acme.above.com. 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.