Every .dk domain that delegates its _acme-challenge name to 8715ffa2-26f2-4c26-b49e-948d0dc14558.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.