Every .dk domain that delegates its _acme-challenge name to d377d5b7-5bc1-4b0e-9876-87c8c0a7951d.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.