Every .dk domain that delegates its _acme-challenge name to 1712fae5-2e78-4ce8-a734-b269b895a8ca.auth.procopa.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.