Every .dk domain that delegates its _acme-challenge name to 604a5bde-d17c-4e34-bc59-f403c9abc1b7.auth.fqq.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.