The nameserver ns5.hostonline.dk appears in the delegation of 758 .dk domains in our dataset — 0.06% of every scanned .dk domain. The full list is below — here is how those domains look under the hood.

On the DNSSEC side, 667 (88.0%) validate as secure — comfortably above the zone-wide average of 62.8%, while 54 (7.1%) are unsigned, and 17 (2.2%) currently fail validation outright (bogus) — a further 20 come back indeterminate.

One thing worth flagging: 37 of these domains (4.9%) 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.