The nameserver ns4.gullestrupnet.dk appears in the delegation of 77 .dk domains in our dataset — 0.01% of every scanned .dk domain. The full list is below — here is how those domains look under the hood.

On the DNSSEC side, 1 (1.3%) validate as secure — below the zone-wide average of 62.7%, while 61 (79.2%) are unsigned, with none failing validation outright — a further 15 come back indeterminate.

One thing worth flagging: 14 of these domains (18.2%) 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.