Every .dk domain that delegates its _acme-challenge name to e958131c-6e39-41d9-9422-e4a1e5a2b84b.2.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.