The nameserver ns3.openprovider.eu appears in the delegation of 1,824 .dk domains in our dataset — 0.14% of every scanned .dk domain. The full list is below — here is how those domains look under the hood.

On the DNSSEC side, 3 (0.2%) validate as secure — below the zone-wide average of 62.6%, while 1,731 (94.9%) are unsigned, and 1 (0.1%) currently fail validation outright (bogus) — a further 89 come back indeterminate.

One thing worth flagging: 71 of these domains (3.9%) 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.