idrætsundervisning.dk is a .dk domain served by 2 nameservers (dakota.ns.cloudflare.com, hadlee.ns.cloudflare.com). It was registered on 9 December 2020 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.87.42 is hosted by Cloudflare, Inc. (AS13335). The zone is DNSSEC-signed but currently fails validation, 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 |
|---|---|---|---|---|---|---|---|
| 104.21.87.42 | 600s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.140.144 | 600s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 104.21.87.42 |
| 🔶 Autoconfig | 104.21.87.42 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3030::ac43:8c90 | 600s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::6815:572a | 600s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.87.42,172.67.140.144 ech=AEX+DQBBlQAgACDnSgxnRW6czUhZEVI7ZNY8PKX12iSlZ0zAgdKaepP+JgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::ac43:8c90,2606:4700:3037::6815:572a |
| www | 104.21.87.42 172.67.140.144 2606:4700:3030::ac43:8c90 2606:4700:3037::6815:572a (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network idrætsundervisning.dk: 104.21.87.42 172.67.140.144 2606:4700:3030::ac43:8c90 2606:4700:3037::6815:572a (AS13335) www.idrætsundervisning.dk: 104.21.87.42 172.67.140.144 2606:4700:3030::ac43:8c90 2606:4700:3037::6815:572a (AS13335) |
| Wildcard | Yes: any name under the zone resolves |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
| Check | Result |
|---|---|
| Validation Status | ⚠️ Bogus |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | resolution failed: ncache nxdomain |
| Field | Value |
|---|---|
| Serial | 2406625977 |
| Primary NS (MNAME) | dakota.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 | 2020-12-09 |
| Expires | 2026-12-31 (64d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-07 02:20:17 | 2638ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-10-05 23:24:57 | 658ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-09-29 22:38:55 | 584ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-09-18 21:51:14 | 766ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-08-27 22:13:54 | 1576ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-08-19 17:25:20 | 983ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-08-08 01:08:39 | 989ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-07-26 23:33:59 | 916ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-07-19 20:14:40 | 707ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-07-03 20:45:35 | 6005ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-06-25 04:33:53 shown | 943ms | 2 NS 2 A 0 MX | ⚠️ Bogus |
| 2026-06-21 07:30:23 | 589ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-06-19 03:32:27 | 1425ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-06-17 14:32:52 | 363ms | 0 NS 0 A 0 MX | ❓ Unknown |