Every .dk domain that delegates its _acme-challenge name to 965f5472-761a-4e2d-9179-48577f8207c0.16.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.