This page lists every .dk domain whose delegation includes the nameserver rdns1.23m.com, 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 |
|---|---|---|---|
| 136.87.45.in-addr.arpa | 45.87.136.0/24 | 1 | 2026-10-16 |
| 192.113.62.in-addr.arpa | 62.113.192.0/24 | 1 | 2026-10-16 |
| 194.113.62.in-addr.arpa | 62.113.194.0/24 | 1 | 2026-10-16 |
| 202.113.62.in-addr.arpa | 62.113.202.0/24 | 1 | 2026-10-16 |
| 223.113.62.in-addr.arpa | 62.113.223.0/24 | 1 | 2026-10-16 |
| 232.113.62.in-addr.arpa | 62.113.232.0/24 | 1 | 2026-10-15 |
| 234.113.62.in-addr.arpa | 62.113.234.0/24 | 1 | 2026-10-16 |
| 242.113.62.in-addr.arpa | 62.113.242.0/24 | 1 | 2026-10-16 |
| 32.83.212.in-addr.arpa | 212.83.32.0/24 | 1 | 2026-10-15 |
| 34.83.212.in-addr.arpa | 212.83.34.0/24 | 1 | 2026-10-16 |
| 35.83.212.in-addr.arpa | 212.83.35.0/24 | 1 | 2026-10-16 |
| 40.83.212.in-addr.arpa | 212.83.40.0/24 | 1 | 2026-10-16 |
| 50.83.212.in-addr.arpa | 212.83.50.0/24 | 1 | 2026-10-16 |
| 51.83.212.in-addr.arpa | 212.83.51.0/24 | 1 | 2026-10-16 |
in-addr.arpa / ip6.arpa zones delegated to rdns1.23m.com, 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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