Every .dk domain that delegates its _acme-challenge name to 6fc33862-8bf7-4fc8-bb64-6fbd4b180d42.certauth.republica.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.