Every .dk domain that delegates its _acme-challenge name to 38b14d2a-d3ed-4c44-be97-a83063704c08.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.