Every .dk domain that delegates its _acme-challenge name to 2986e3e8-8cc0-4b0b-a15e-bbde35385005.acme.kb.dk. 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.