The nameserver matt.ns.cloudflare.com appears in the delegation of 891 .dk domains in our dataset — 0.07% of every scanned .dk domain. The full list is below — here is how those domains look under the hood.

On the DNSSEC side, 17 (1.9%) validate as secure — below the zone-wide average of 62.7%, while 852 (95.6%) are unsigned, and 1 (0.1%) currently fail validation outright (bogus) — a further 21 come back indeterminate.

One thing worth flagging: 6 of these domains (0.7%) look like lame delegations — the .dk registry still points them here, but this nameserver doesn't answer authoritatively for the zone, which usually means the hosting was cancelled and the delegation was left dangling.