Every .dk domain that delegates its _acme-challenge name to b0c3ab92-0f2e-4147-9237-05a8b600ee34.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.