The nameserver ns3.simply.com appears in the delegation of 303,680 .dk domains in our dataset — 22.83% of every scanned .dk domain. The full list is below — here is how those domains look under the hood.

On the DNSSEC side, 273,463 (90.0%) validate as secure — comfortably above the zone-wide average of 62.8%, while 9,545 (3.1%) are unsigned, and 2,480 (0.8%) currently fail validation outright (bogus) — a further 18,192 come back indeterminate.

One thing worth flagging: 20,233 of these domains (6.7%) 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.