This page lists every .dk domain whose delegation includes the nameserver ns21.colt.net, together with its IP addresses, network, zone-transfer and ANY-query behaviour, the protocols and RFCs it supports (TCP, EDNS, cookies, NSID, DNS over TLS/HTTPS …), the nameserver sets it is used in and how fast those sets answer. Use it to size a DNS provider, audit a migration or find domains still pointing at an old server. Data comes from our own scanners, which re-resolve every .dk domain in the zone roughly once a week.
Not probed yet. This nameserver is queued; the probe runs in the background and the result usually shows here within a few minutes.
| Reverse zone | Prefix | Prefixes | Checked |
|---|---|---|---|
| 61.213.in-addr.arpa | 213.61.0.0/16 | 4 | 2026-10-16 |
| 86.213.in-addr.arpa | 213.86.0.0/16 | 3 | 2026-10-16 |
| 110.217.in-addr.arpa | 217.110.0.0/16 | 2 | 2026-10-16 |
| 111.217.in-addr.arpa | 217.111.0.0/16 | 2 | 2026-10-13 |
| 163.217.in-addr.arpa | 217.163.0.0/16 | 2 | 2026-10-16 |
| 169.80.in-addr.arpa | 80.169.0.0/16 | 2 | 2026-10-16 |
| 23.62.in-addr.arpa | 62.23.0.0/16 | 2 | 2026-10-16 |
| 0.41.213.in-addr.arpa | 213.41.0.0/24 | 1 | 2026-10-09 |
| 0.80.80.in-addr.arpa | 80.80.0.0/24 | 1 | 2026-10-13 |
| 110.35.212.in-addr.arpa | 212.35.110.0/24 | 1 | 2026-10-16 |
| 128.27.213.in-addr.arpa | 213.27.128.0/24 | 1 | 2026-10-15 |
| 146.27.213.in-addr.arpa | 213.27.146.0/24 | 1 | 2026-10-16 |
| 152.229.213.in-addr.arpa | 213.229.152.0/24 | 1 | 2026-10-16 |
| 155.27.213.in-addr.arpa | 213.27.155.0/24 | 1 | 2026-10-16 |
| 156.244.213.in-addr.arpa | 213.244.156.0/24 | 1 | 2026-10-16 |
| 159.27.213.in-addr.arpa | 213.27.159.0/24 | 1 | 2026-10-16 |
| 16.80.80.in-addr.arpa | 80.80.16.0/24 | 1 | 2026-10-16 |
| 160.16.84.in-addr.arpa | 84.16.160.0/24 | 1 | 2026-10-08 |
| 167.16.84.in-addr.arpa | 84.16.167.0/24 | 1 | 2026-10-16 |
| 168.16.84.in-addr.arpa | 84.16.168.0/24 | 1 | 2026-10-16 |
| 18.80.80.in-addr.arpa | 80.80.18.0/24 | 1 | 2026-10-16 |
| 192.123.212.in-addr.arpa | 212.123.192.0/24 | 1 | 2026-10-02 |
| 199.67.62.in-addr.arpa | 62.67.199.0/24 | 1 | 2026-10-16 |
| 2.80.80.in-addr.arpa | 80.80.2.0/24 | 1 | 2026-10-16 |
| 224.123.212.in-addr.arpa | 212.123.224.0/24 | 1 | 2026-10-16 |
| 224.3.212.in-addr.arpa | 212.3.224.0/24 | 1 | 2026-10-09 |
| 224.31.212.in-addr.arpa | 212.31.224.0/24 | 1 | 2026-10-16 |
| 251.31.212.in-addr.arpa | 212.31.251.0/24 | 1 | 2026-10-16 |
| 26.80.80.in-addr.arpa | 80.80.26.0/24 | 1 | 2026-10-16 |
| 31.41.213.in-addr.arpa | 213.41.31.0/24 | 1 | 2026-10-16 |
| 41.41.213.in-addr.arpa | 213.41.41.0/24 | 1 | 2026-10-16 |
| 8.80.80.in-addr.arpa | 80.80.8.0/24 | 1 | 2026-10-16 |
| 96.62.in-addr.arpa | 62.96.0.0/16 | 1 | 2026-10-16 |
| 97.35.212.in-addr.arpa | 212.35.97.0/24 | 1 | 2026-10-16 |
in-addr.arpa / ip6.arpa zones delegated to ns21.colt.net, found from the SOA of the reverse name of each IPv4 /24 behind the zone's websites (and any CIDR page viewed), so the zone is the real delegation point, at whatever prefix length it sits. A /24 whose reverse delegation is broken (SERVFAIL) is not credited to anyone.
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