Every .dk domain that delegates its _acme-challenge name to d59f7f15-1fa3-47fc-89e7-cf72bd53f53d.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.