Every .dk domain that delegates its _acme-challenge name to 2dc58f26-331a-4230-b42c-323c103a4982.trustzonevalidation.com. 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.