Every .dk domain that delegates its _acme-challenge name to 76648f5a-9d0b-4be3-a16f-e5222d475508.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.