Every .dk domain that delegates its _acme-challenge name to 839e1851-3b4b-4bdf-b1a8-74ee8bb22ade.acmeauth.lithosting.dk. 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.