kryptoundervisning.dk is a .dk domain served by 2 nameservers (agustin.ns.cloudflare.com, venus.ns.cloudflare.com). It was registered on 20 January 2023 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.30.135 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 |
|---|---|---|---|---|---|---|---|
| 104.21.30.135 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.172.244 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 104.21.30.135 |
| 🔶 Autoconfig | 172.67.172.244 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3030::6815:1e87 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::ac43:acf4 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.30.135,172.67.172.244 ech=AEX+DQBBMAAgACABzaKDD33cg8+QszUVx0qktoB0SUiklHKEKWDDwh9LNwAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::6815:1e87,2606:4700:3037::ac43:acf4 |
| www | 104.21.30.135 172.67.172.244 2606:4700:3030::6815:1e87 2606:4700:3037::ac43:acf4 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network kryptoundervisning.dk: 104.21.30.135 172.67.172.244 2606:4700:3030::6815:1e87 2606:4700:3037::ac43:acf4 (AS13335) www.kryptoundervisning.dk: 104.21.30.135 172.67.172.244 2606:4700:3030::6815:1e87 2606:4700:3037::ac43:acf4 (AS13335) |
| Wildcard | Yes: any name under the zone resolves |
| 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 | 2416293887 |
| Primary NS (MNAME) | agustin.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Simply.com A/S |
| Registered | 2023-01-20 |
| Expires | 2027-01-19 (87d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-01 18:42:56 shown | 671ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-30 18:33:00 | 661ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-29 18:28:10 | 470ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-22 10:30:41 | 1376ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-27 21:37:37 | 735ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-09 20:12:53 | 1127ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-07-23 18:09:33 | 806ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-28 04:57:43 | 673ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-25 19:12:03 | 907ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-25 11:25:41 | 2714ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-18 03:19:32 | 774ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-18 02:58:27 | 713ms | 2 NS 2 A 0 MX | 🔓 Insecure |