Every .dk domain whose A record resolves to 81.21.253.42. Shared-hosting servers often carry hundreds of sites on one address; this reverse IP lookup shows exactly which .dk names share it. Data comes from our own scanners, which re-resolve every .dk domain in the zone roughly once a week.
| CIDR | Reverse zone | Nameservers |
|---|---|---|
| 81.21.240.0/20 | 240.21.81.in-addr.arpa | falun.dns.swip.net kalmar.dns.swip.net |
The zone shown is the most specific level that answers an NS query, so a classless delegation may report its parent.