Every .dk domain that delegates its _acme-challenge name to 90ed19df-9ee5-4b69-ad60-1164cfcb9e02.3.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.