Every .dk domain that delegates its _acme-challenge name to 99e7d7f2-7c6e-4eec-8991-b3866aa1fb91.4.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.