Every .dk domain that delegates its _acme-challenge name to e5e32e71-62a1-4895-9036-7d7c4103e433.auth.acme-challenge.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.