Every .dk domain that delegates its _acme-challenge name to 360a7dbb-5505-4a28-97bf-847d73d4bd75.validation.litium.cloud. 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.