Every .dk domain that delegates its _acme-challenge name to eb9f7907-af44-4e9e-b7c7-dfdf23a3f04a.15.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.