The nameserver ns.udag.de appears in the delegation of 2,741 .dk domains in our dataset — 0.21% of every scanned .dk domain. The full list is below — here is how those domains look under the hood.

On the DNSSEC side, 24 (0.9%) validate as secure — below the zone-wide average of 62.6%, while 2,622 (95.7%) are unsigned, with none failing validation outright — a further 95 come back indeterminate.

One thing worth flagging: 60 of these domains (2.2%) 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.