The nameserver dns3.rackhosting.com appears in the delegation of 948 .dk domains in our dataset — 0.07% of every scanned .dk domain. The full list is below — here is how those domains look under the hood.

On the DNSSEC side, 5 (0.5%) validate as secure — below the zone-wide average of 62.8%, while 568 (59.9%) are unsigned, and 2 (0.2%) currently fail validation outright (bogus) — a further 373 come back indeterminate.

One thing worth flagging: 366 of these domains (38.6%) 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.