Every .dk domain that delegates its _acme-challenge name to e88b066d-8dcd-483e-9ac4-e1f4f7dc0c36.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.