Every .dk domain that delegates its _acme-challenge name to 90294dc0-488c-41c0-8799-eb0370d30b4c.acmedns.infinityfree.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.