Every .dk domain that delegates its _acme-challenge name to d5c75729-daf0-485e-844f-331c55ea661c.4yjx9v.pv-cp.net. 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.