Every .dk domain that delegates its _acme-challenge name to b60363d6-9482-4d12-8f1e-58a0d3667f79.0.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.