supermatematik.dk is a .dk domain served by 2 nameservers (ns.dandomain.dk, ns2.dandomain.dk). It was registered on 22 April 2018 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 89.188.76.144 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by mail.supermatematik.dk. 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 |
|---|---|---|---|---|---|---|---|
| 89.188.76.144 | 3600s | mail.supermatematik.dk | AS48854 | team.blue Denmark A/S | 89.188.72.0/21 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | mail.supermatematik.dk | 89.188.76.144 | mail.supermatematik.dk | AS48854 team.blue Denmark A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 89.188.76.144 |
| 🔶 Autoconfig | 89.188.76.144 |
| TXT Record |
|---|
| v=spf1 a mx -all |
| Policy | Record (supermatematik.dk) |
|---|---|
| -all (hard fail) | v=spf1 a mx -all |
| Policy | Record (_dmarc.supermatematik.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none |
| www | 89.188.76.144 (AS48854) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
| Denial of existence | NSEC3 · 1 iteration · 1-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| default | — | RSA · ~1024 bit below 2048 bit |
DKIM selectors can't be listed, so we check the common ones (Microsoft 365, Google, Mailchimp, SendGrid, generic). Keys under other selectors aren't shown.
DNS lookups: 2/10 · policy: -all
No problems found| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.supermatematik.dk | qdNUDLuftGAzZc5PffKyDpnSI9uvwlke9YYwi-WsiWM |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026060304 |
| Primary NS (MNAME) | ns.dandomain.dk |
| Responsible (RNAME) | hostmaster@dandomain.dk |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 300s |
| Field | Value |
|---|---|
| Registrar | DANDOMAIN A/S |
| Registered | 2018-04-22 |
| Expires | 2028-04-30 (555d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-30 13:58:53 | 481ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-29 17:37:13 | 362ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-29 14:43:59 | 1438ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-09 07:26:27 | 435ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-26 07:00:42 | 750ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-25 23:32:55 shown | 1402ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-18 07:41:35 | 2534ms | 2 NS 1 A 1 MX | 🔒 Secure |