Every .dk domain that delegates its _acme-challenge name to 05b6a3e9-03ce-4613-81d1-565aced7a1d8.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.