The nameserver helium.ns.hetzner.de appears in the delegation of 2,050 .dk domains in our dataset — 0.15% of every scanned .dk domain. The full list is below — here is how those domains look under the hood.

On the DNSSEC side, 4 (0.2%) validate as secure — below the zone-wide average of 62.7%, while 1,970 (96.1%) are unsigned, and 1 (0.0%) currently fail validation outright (bogus) — a further 75 come back indeterminate.

One thing worth flagging: 55 of these domains (2.7%) 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.