formatmatematik.dk is a .dk domain served by 2 nameservers (cortney.ns.cloudflare.com, eric.ns.cloudflare.com). It was registered on 27 May 2014 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.66.200 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mx01.dandomain.dk. The zone is not DNSSEC-signed, has no DMARC policy and is reachable over IPv6. 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 |
|---|---|---|---|---|---|---|---|
| 104.21.66.200 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.207.59 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 300s | mx01.dandomain.dk | 212.237.249.50 | mx1.dandomain.dk | AS48854 team.blue Denmark A/S |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3031::6815:42c8 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3034::ac43:cf3b | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.66.200,172.67.207.59 ech=AEX+DQBBgQAgACD5W2Lp06CDigxn1fV9bCgoSig7Dm8iTf0hqfCrQp7uGAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3031::6815:42c8,2606:4700:3034::ac43:cf3b |
| www | 104.21.66.200 172.67.207.59 2606:4700:3031::6815:42c8 2606:4700:3034::ac43:cf3b (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network formatmatematik.dk: 104.21.66.200 172.67.207.59 2606:4700:3031::6815:42c8 2606:4700:3034::ac43:cf3b (AS13335) www.formatmatematik.dk: 104.21.66.200 172.67.207.59 2606:4700:3031::6815:42c8 2606:4700:3034::ac43:cf3b (AS13335) |
| Wildcard | No |
| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.formatmatematik.dk | 9JUajdHQBucY0ZVsJKtGgKaQ443hv_A_tNxj1kWvbO4 |
| TXT | _acme-challenge.formatmatematik.dk | H9jWxVHY4Bhdf-1LxHZ9h4g5cSOgGVjrKKy96PxHPkE |
| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2414020549 |
| Primary NS (MNAME) | cortney.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2014-05-27 |
| Expires | 2027-05-31 (225d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-01 04:30:59 | 558ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-28 09:01:51 | 697ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-25 08:29:00 | 744ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-17 20:02:20 | 1017ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-10 18:07:10 shown | 1922ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-10 18:03:09 | 985ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-23 10:44:23 | 1164ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-06 03:57:11 | 1884ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-07-01 07:50:23 | 627ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-26 04:55:49 | 685ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-23 20:31:50 | 826ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-23 03:16:49 | 3836ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-22 21:59:15 | 967ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-22 17:47:42 | 845ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-21 21:34:19 | 1583ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-20 12:19:41 | 674ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-17 10:09:32 | 2029ms | 2 NS 2 A 1 MX | 🔓 Insecure |