Every .dk domain that delegates its _acme-challenge name to bfa8f4b6-8c39-45b2-94db-e4d327e263d6.17.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.