Every .dk domain that delegates its _acme-challenge name to 2c5d765a-3dcf-4f8c-801f-6466f9c177e4.acme-dns.deic.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.