Every .dk domain that delegates its _acme-challenge name to 8c6e8c71-7ea2-4b11-bcf3-1de3d94fb396.auth.acme-dns.io. 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.