problemformulering.dk is a .dk domain served by 2 nameservers (hazel.ns.cloudflare.com, sergi.ns.cloudflare.com). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.13.107 is hosted by Cloudflare, Inc. (AS13335). The zone is not DNSSEC-signed, has no DMARC policy and is reachable over IPv6. 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 |
|---|---|---|---|---|---|---|---|
| 104.21.13.107 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.199.214 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3033::6815:d6b | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::ac43:c7d6 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.13.107,172.67.199.214 ech=AEX+DQBBTwAgACCno/eBPBx7CpOoxP8qGTAM2e+ar7jX+9dnljjdA21ufAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3033::6815:d6b,2606:4700:3037::ac43:c7d6 |
| www | 104.21.13.107 172.67.199.214 2606:4700:3033::6815:d6b 2606:4700:3037::ac43:c7d6 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network problemformulering.dk: 104.21.13.107 172.67.199.214 2606:4700:3033::6815:d6b 2606:4700:3037::ac43:c7d6 (AS13335) www.problemformulering.dk: 104.21.13.107 172.67.199.214 2606:4700:3033::6815:d6b 2606:4700:3037::ac43:c7d6 (AS13335) |
| Wildcard | No |
| 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 | 2413872511 |
| Primary NS (MNAME) | hazel.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-22 22:42:48 shown | 446ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-10-21 10:45:43 | 610ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-10-04 04:13:19 | 355ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-10-01 00:40:23 | 423ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-29 20:07:30 | 641ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-04 16:42:06 | 662ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-07-04 17:23:36 | 1087ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-30 00:12:35 | 970ms | 4 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-26 02:51:02 | 625ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-23 05:29:48 | 3435ms | 4 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-22 01:30:43 | 905ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-20 22:39:31 | 1121ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-18 12:06:40 | 972ms | 4 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-17 12:07:38 | 928ms | 4 NS 1 A 1 MX | 🔓 Insecure |