Every .dk domain that delegates its _acme-challenge name to 176d87d7-8db6-4667-96e0-a01b42e24de5.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.