duerr.dk is a .dk domain served by 3 nameservers (ns.udag.de, ns.udag.net, ns.udag.org). It was registered on 10 April 2000 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 89.31.143.90 is hosted by united-domains GmbH (AS202108) in Germany. Mail is handled by mx00.udag.de, mx01.udag.de. The zone is of unknown DNSSEC status, has no DMARC policy and has no IPv6 address. Below are all of its DNS records from this scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 89.31.143.90 | 600s | — | AS202108 | united-domains GmbH | 89.31.142.0/23 | 🇩🇪 Germany | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | mx00.udag.de | 62.146.106.39 | mx00.udag.de | AS15598 NorthC Deutschland GmbH |
| 10 | 3600s | mx01.udag.de | 62.146.106.40 | mx01.udag.de | AS15598 NorthC Deutschland GmbH |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 89.31.143.90 |
| 🔶 Autoconfig | 89.31.143.90 |
| TXT Record |
|---|
| v=spf1 include:_smtp.udag.de ~all |
| Policy | Record (duerr.dk) |
|---|---|
| ~all (soft fail) | v=spf1 include:_smtp.udag.de ~all |
| www | 89.31.143.90 (AS202108) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
| Denial of existence | NSEC3 · 21 iterations · 24-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 1/10 · policy: ~all
No problems found| Check | Result |
|---|---|
| Validation Status | ❓ Unknown |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✓ Found |
| Flags | broken trust chain resolving 'duerr.dk/A/IN': 127.0.0.53#53 |
| Field | Value |
|---|---|
| Serial | 2024021110 |
| Primary NS (MNAME) | ns.udag.de |
| Responsible (RNAME) | hostmaster@united-domains.de |
| Refresh | 10800s |
| Retry | 3600s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2000-04-10 |
| Expires | 2027-06-30 (247d) |
Other .dk domains whose WHOIS registrant has the same name and postal address. Matched on a keyed hash: the registrant's details are not stored or shown. Covers only domains whose WHOIS we have fetched (refreshed about monthly).
No other domain with this registrant in our WHOIS data yet| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-09 14:43:53 | 781ms | 3 NS 1 A 2 MX | 🔓 Insecure |
| 2026-09-30 04:25:39 | 2431ms | 3 NS 1 A 2 MX | 🔓 Insecure |
| 2026-09-29 14:53:50 | 1657ms | 3 NS 1 A 2 MX | 🔓 Insecure |
| 2026-08-27 21:43:22 | 9686ms | 3 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-26 07:17:36 shown | 1978ms | 3 NS 1 A 2 MX | ❓ Unknown |
| 2026-06-26 00:49:06 | 850ms | 3 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-20 01:22:07 | 1393ms | 3 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-17 04:55:03 | 756ms | 3 NS 1 A 2 MX | 🔓 Insecure |