Every .dk domain that delegates its _acme-challenge name to 6a49e288-4f5a-4220-b473-9391107d4fc6.acme.formula.nu. 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.