The nameserver ns1.netio.cz appears in the delegation of 3 .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, 0 (0.0%) validate as secure — below the zone-wide average of 62.7%, while 2 (66.7%) are unsigned, with none failing validation outright — a further 1 come back indeterminate.

One thing worth flagging: 1 of these domain (33.3%) 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.