serum.dk is a .dk domain served by 2 nameservers (ns6.sitnet.dk, ns7.sitnet.dk). It was registered on 16 July 1996 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 40.68.148.255 is hosted by Microsoft Corporation (AS8075) in The Netherlands. 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.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns6.sitnet.dk | 107.162.234.197 2604:e180:1071::3:1 |
— — |
AS55002 F5, Inc. AS55002 F5, Inc. |
| ns7.sitnet.dk | 107.162.176.221 2604:e180:1071::ffff:6ba2:b0dd |
— — |
AS55002 F5, Inc. AS55002 F5, Inc. |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 40.68.148.255 | 3600s | — | AS8075 | Microsoft Corporation | 40.68.0.0/14 | 🇳🇱 The Netherlands | Amsterdam |
| TXT Record |
|---|
| v=spf1 -all |
| Policy | Record (serum.dk) |
|---|---|
| -all (hard fail) | v=spf1 -all |
| Policy | Record (_dmarc.serum.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; sp=reject; rua=mailto:tcod1eh2@ag.eu.dmarcadvisor.com; |
| www CNAME | serum.dk (all on serum.dk) → 40.68.148.255 (AS8075) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC3 · 10 iterations · 10-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 | 1961 |
| Primary NS (MNAME) | sit-dhcp001.prod.sitad.dk |
| Responsible (RNAME) | hostmaster@statens-it.dk |
| Refresh | 10800s |
| Retry | 1080s |
| Expire | 2419200s |
| Minimum (neg-cache TTL) | 300s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 1996-07-16 |
| Expires | 2030-09-30 (1442d) |
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 |
|---|---|---|---|
| 2026-10-18 20:28:23 | 1469ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-17 19:56:35 | 17842ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-16 19:48:38 | 9352ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-15 19:16:03 | 17636ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-14 17:47:44 | 3101ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-13 17:13:26 | 5226ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-12 15:04:16 | 17425ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-11 14:15:22 | 9834ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-10 13:40:24 | 6278ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-09 02:22:41 | 17325ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-08 02:21:41 | 2775ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-07 02:18:29 | 5227ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-06 00:36:44 | 1461ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-05 00:34:18 | 1373ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-04 00:30:54 | 1160ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-03 00:28:54 | 1428ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-02 00:22:11 shown | 17549ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-01 00:10:43 | 5322ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-30 06:14:36 | 17343ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-29 06:06:30 | 4193ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-28 05:51:17 | 17445ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-27 05:28:55 | 17399ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-26 05:16:51 | 4739ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-25 22:03:00 | 9417ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-24 21:58:08 | 1181ms | 2 NS 1 A 0 MX | 🔒 Secure |