This page lists every .dk domain whose delegation includes the nameserver ns1.first-colo.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 |
|---|---|---|---|
| 106.224.212.in-addr.arpa | 212.224.106.0/24 | 1 | 2026-10-13 |
| 108.224.212.in-addr.arpa | 212.224.108.0/24 | 1 | 2026-10-15 |
| 110.224.212.in-addr.arpa | 212.224.110.0/24 | 1 | 2026-10-16 |
| 115.224.212.in-addr.arpa | 212.224.115.0/24 | 1 | 2026-10-16 |
| 13.100.159.in-addr.arpa | 159.100.13.0/24 | 1 | 2026-10-13 |
| 17.100.159.in-addr.arpa | 159.100.17.0/24 | 1 | 2026-10-18 |
| 18.100.159.in-addr.arpa | 159.100.18.0/24 | 1 | 2026-10-18 |
| 19.100.159.in-addr.arpa | 159.100.19.0/24 | 1 | 2026-10-16 |
| 6.100.159.in-addr.arpa | 159.100.6.0/24 | 1 | 2026-10-18 |
| 64.224.212.in-addr.arpa | 212.224.64.0/24 | 1 | 2026-10-08 |
| 78.224.212.in-addr.arpa | 212.224.78.0/24 | 1 | 2026-10-16 |
| 86.224.212.in-addr.arpa | 212.224.86.0/24 | 1 | 2026-10-13 |
| 88.172.31.in-addr.arpa | 31.172.88.0/24 | 1 | 2026-10-18 |
| 90.172.31.in-addr.arpa | 31.172.90.0/24 | 1 | 2026-10-16 |
| 92.224.212.in-addr.arpa | 212.224.92.0/24 | 1 | 2026-10-17 |
in-addr.arpa / ip6.arpa zones delegated to ns1.first-colo.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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