dou.dk is a .dk domain served by 3 nameservers (ns1.sdu.dk, ns2.sdu.dk, ns3.sdu.dk). It was registered on 3 February 1998 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 130.225.156.23 is hosted by IDDQD-AS (AS1835) in Denmark. Mail is handled by .. The zone is DNSSEC-signed and validates, publishes a 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 |
|---|---|---|---|---|---|---|---|
| 130.225.156.23 | 3600s | — | AS1835 | IDDQD-AS | 130.225.0.0/16 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 0 | 3600s | . Null MX — domain accepts no email (RFC 7505) | |||
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 40.104.116.56 |
| TXT Record |
|---|
| MS=ms22994458 |
| v=spf1 -all |
| Policy | Record (dou.dk) |
|---|---|
| -all (hard fail) | v=spf1 -all |
| Policy | Record (_dmarc.dou.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; sp=reject; rua=mailto:655b353a1f136@dmarc.centerasecurity.com; ruf=mailto:dmarc.reports@sdu.dk |
| www | 130.225.156.23 (AS1835) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC3 · 10 iterations · 4-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 0/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2011051144 |
| Primary NS (MNAME) | ns1.sdu.dk |
| Responsible (RNAME) | dns@it-service.sdu.dk |
| Refresh | 43200s |
| Retry | 3600s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | dns.services ApS |
| Registered | 1998-02-03 |
| Expires | 2027-03-31 (164d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-13 16:09:04 | 4304ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-12 12:27:52 | 16880ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-10 08:49:22 | 4310ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-05 03:29:42 | 16465ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-02 03:07:15 | 4337ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-28 01:55:51 shown | 16587ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-27 01:35:09 | 16479ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-25 00:55:31 | 17566ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-24 00:20:10 | 4310ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-23 16:34:26 | 16476ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-18 15:50:55 | 9014ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-11 15:20:15 | 4398ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-08 01:53:23 | 19666ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-31 21:49:53 | 16418ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-29 23:38:03 | 16355ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-26 19:04:34 | 4528ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-24 16:38:55 | 4492ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-23 10:11:04 | 5675ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-22 09:08:28 | 8839ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-18 01:52:35 | 8482ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-16 12:55:51 | 5419ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-14 18:14:55 | 7040ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-10 18:10:05 | 4524ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-09 07:55:51 | 6895ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-02 04:38:20 | 9489ms | 3 NS 1 A 1 MX | 🔒 Secure |