Every .dk domain that delegates its _acme-challenge name to 26b68402-023f-43d8-8e0c-b741c90cce35.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.