matematikportalen.dk is a .dk domain served by 4 nameservers (ns1-03.azure-dns.com, ns2-03.azure-dns.net, ns3-03.azure-dns.org and 1 more). It was registered on 14 March 2011 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 86.58.160.162 is hosted by Sentia Denmark A/S (AS47292) in Denmark. The zone is DNSSEC-signed and validates, publishes a DMARC policy and has no IPv6 address. Below are all of its DNS records from our latest 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 |
|---|---|---|---|---|---|---|---|
| 86.58.160.162 | 3600s | — | AS47292 | Sentia Denmark A/S | 86.58.160.0/21 | 🇩🇰 Denmark | — |
| TXT Record |
|---|
| v=spf1 -all |
| Policy | Record (matematikportalen.dk) |
|---|---|
| -all (hard fail) | v=spf1 -all |
| Policy | Record (_dmarc.matematikportalen.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:62de94a87c3dc@dmarc.centerasecurity.com; |
| www CNAME | matematikportalen.dk (all on matematikportalen.dk) → 86.58.160.162 (AS47292) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | Compact NSEC (RFC 9824, "black lies") not walkable |
| 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 | 1 |
| Primary NS (MNAME) | ns1-03.azure-dns.com |
| Responsible (RNAME) | azuredns-hostmaster@microsoft.com |
| Refresh | 3600s |
| Retry | 300s |
| Expire | 2419200s |
| Minimum (neg-cache TTL) | 300s |
| Field | Value |
|---|---|
| Registrar | WEB SOLUTIONS A/S |
| Registered | 2011-03-14 |
| Expires | 2027-08-31 (308d) |
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).
Showing 100 of 134.
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-26 04:43:18 shown | 565ms | 4 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-02 12:32:58 | 373ms | 4 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-04 08:55:15 | 2355ms | 4 NS 1 A 0 MX | 🔒 Secure |
| 2026-08-27 09:37:33 | 813ms | 4 NS 1 A 0 MX | 🔒 Secure |
| 2026-07-02 17:56:43 | 575ms | 4 NS 1 A 0 MX | 🔒 Secure |
| 2026-06-21 17:17:49 | 483ms | 4 NS 1 A 0 MX | 🔒 Secure |
| 2026-06-20 22:59:32 | 480ms | 4 NS 1 A 0 MX | 🔒 Secure |
| 2026-06-18 09:12:27 | 1176ms | 4 NS 1 A 0 MX | 🔒 Secure |