ou.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) | |||
| TXT Record |
|---|
| v=spf1 -all |
| Policy | Record (ou.dk) |
|---|---|
| -all (hard fail) | v=spf1 -all |
| Policy | Record (_dmarc.ou.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; sp=reject; rua=mailto:655b353a1f136@dmarc.centerasecurity.com; |
| www | 130.225.156.23 (AS1835) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC3 · 10 iterations · 7-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 | 2011097677 |
| Primary NS (MNAME) | ns1.sdu.dk |
| Responsible (RNAME) | dns@it-service.sdu.dk |
| Refresh | 14400s |
| Retry | 1440s |
| Expire | 3600000s |
| Minimum (neg-cache TTL) | 86400s |
| Field | Value |
|---|---|
| Registrar | dns.services ApS |
| Registered | 1998-02-03 |
| Expires | 2027-03-31 (164d) |
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).
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-13 09:47:30 | 16455ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-12 08:02:21 | 16799ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-10 06:08:15 | 17582ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-05 17:27:01 | 4278ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-04 17:24:00 | 4268ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-02 17:18:40 | 4272ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-01 17:16:46 | 6671ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-30 17:00:00 | 4354ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-28 16:44:05 | 16444ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-27 16:31:40 | 16488ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-26 16:16:26 | 16473ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-24 15:59:21 | 16469ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-23 15:35:13 | 16526ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-15 05:09:10 | 9107ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-08 03:09:51 | 16397ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-04 08:03:49 | 16499ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-31 13:34:18 | 16462ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-30 06:56:36 shown | 17103ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-26 23:43:14 | 16347ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-24 03:52:59 | 18335ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-23 01:54:16 | 8873ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-22 01:38:25 | 6495ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-17 18:12:50 | 8536ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-16 02:51:12 | 8661ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-14 17:30:00 | 4669ms | 3 NS 1 A 1 MX | 🔒 Secure |