Every .dk domain that delegates its _acme-challenge name to 07ebcb9d-7b3a-40c2-8812-d1f96a55882f.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.