knowledge.dk is a .dk domain served by 2 nameservers (mary.ns.cloudflare.com, seth.ns.cloudflare.com). It was registered on 15 May 2003 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.61.230 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 |
|---|---|---|---|---|---|---|---|
| 104.21.61.230 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.216.11 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | nicolaj.com → 104.21.5.33 |
| 🔶 Autoconfig | nicolaj.com → 172.67.132.220 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3031::6815:3de6 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3035::ac43:d80b | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.61.230,172.67.216.11 ech=AEX+DQBBXAAgACBLHCSisKQRa+uMs8ER3+Z4Qzw30lzeS4B2HnTrVTU5bAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3031::6815:3de6,2606:4700:3035::ac43:d80b |
| www | 104.21.61.230 172.67.216.11 2606:4700:3031::6815:3de6 2606:4700:3035::ac43:d80b (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network knowledge.dk: 104.21.61.230 172.67.216.11 2606:4700:3031::6815:3de6 2606:4700:3035::ac43:d80b (AS13335) www.knowledge.dk: 104.21.61.230 172.67.216.11 2606:4700:3031::6815:3de6 2606:4700:3035::ac43:d80b (AS13335) |
| Wildcard | Yes: any name under the zone resolves |
| Type | Name | Value |
|---|---|---|
| CNAME | _acme-challenge.knowledge.dk | nicolaj.com |
| 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 | 2416289598 |
| Primary NS (MNAME) | mary.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 | 2003-05-15 |
| Expires | 2027-05-31 (224d) |
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).
| Domain | Registrar |
|---|---|
| goodtech.dk | Punktum dk A/S (direct) |
| seamlesscare.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-01 11:51:26 shown | 1740ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-30 11:47:49 | 649ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-30 05:38:36 | 432ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-16 15:54:27 | 1979ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-09 01:23:17 | 1226ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-28 10:10:24 | 749ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-27 01:33:05 | 1126ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-03 19:00:24 | 25366ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-07-12 12:20:42 | 1113ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-21 22:16:34 | 1210ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-20 22:25:10 | 1159ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-20 18:28:04 | 753ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-20 01:07:52 | 879ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-19 19:19:44 | 748ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-18 07:46:32 | 1085ms | 2 NS 2 A 0 MX | ⚠️ Bogus |