Every .dk domain that delegates its _acme-challenge name to 4d47f3a7-dfe7-4d33-98ca-ccad4237a834.auth.viamap.net. 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.