Every .dk domain that delegates its _acme-challenge name to baa41e23-5583-4cd9-94ce-e9d2cc7eb55d.6.authorize.certificatemanager.goog. 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.