This page lists every .dk domain whose delegation includes the nameserver ns1.optical.no, 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 |
|---|---|---|---|
| 144.90.134.in-addr.arpa | 134.90.144.0/24 | 1 | 2026-10-09 |
| 146.90.134.in-addr.arpa | 134.90.146.0/24 | 1 | 2026-10-02 |
| 147.255.178.in-addr.arpa | 178.255.147.0/24 | 1 | 2026-10-16 |
| 147.90.134.in-addr.arpa | 134.90.147.0/24 | 1 | 2026-10-16 |
| 184.205.91.in-addr.arpa | 91.205.184.0/24 | 1 | 2026-10-11 |
| 185.205.91.in-addr.arpa | 91.205.185.0/24 | 1 | 2026-10-16 |
| 187.205.91.in-addr.arpa | 91.205.187.0/24 | 1 | 2026-10-16 |
| 56.12.185.in-addr.arpa | 185.12.56.0/24 | 1 | 2026-10-11 |
| 56.202.37.in-addr.arpa | 37.202.56.0/24 | 1 | 2026-10-16 |
| 8.c.0.2.2.0.a.2.ip6.arpa | 2a02:20c8::/32 | 1 | 2026-10-16 |
in-addr.arpa / ip6.arpa zones delegated to ns1.optical.no, 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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