Every .dk domain that delegates its _acme-challenge name to 0a1675d3-ed4e-4df2-ab9f-99e9fe19f3b6.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.