This page lists every .dk domain whose delegation includes the nameserver dns4.a1.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 |
|---|---|---|---|
| 117.33.213.in-addr.arpa | 213.33.117.0/24 | 1 | 2026-10-11 |
| 125.120.80.in-addr.arpa | 80.120.125.0/24 | 1 | 2026-10-16 |
| 128.121.80.in-addr.arpa | 80.121.128.0/24 | 1 | 2026-10-17 |
| 153.121.80.in-addr.arpa | 80.121.153.0/24 | 1 | 2026-10-16 |
| 16.120.80.in-addr.arpa | 80.120.16.0/24 | 1 | 2026-10-13 |
| 160.120.80.in-addr.arpa | 80.120.160.0/24 | 1 | 2026-10-11 |
| 169.120.80.in-addr.arpa | 80.120.169.0/24 | 1 | 2026-10-16 |
| 17.120.80.in-addr.arpa | 80.120.17.0/24 | 1 | 2026-10-16 |
| 64.120.80.in-addr.arpa | 80.120.64.0/24 | 1 | 2026-10-15 |
| 64.33.213.in-addr.arpa | 213.33.64.0/24 | 1 | 2026-10-13 |
| 64.81.193.in-addr.arpa | 193.81.64.0/24 | 1 | 2026-10-11 |
| 69.33.213.in-addr.arpa | 213.33.69.0/24 | 1 | 2026-10-16 |
| 70.120.80.in-addr.arpa | 80.120.70.0/24 | 1 | 2026-10-16 |
in-addr.arpa / ip6.arpa zones delegated to dns4.a1.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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