Every .dk domain that delegates its _acme-challenge name to 5f89f700-a03b-4d71-961b-0e05cbb6cb0f.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.