effective-learning.dk is a .dk domain served by 2 nameservers (aragorn.ns.cloudflare.com, brianna.ns.cloudflare.com). It was registered on 16 July 2018 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.9.175 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 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 |
|---|---|---|---|---|---|---|---|
| 104.21.9.175 | 600s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.161.35 | 600s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3030::6815:9af | 600s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::ac43:a123 | 600s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.9.175,172.67.161.35 ech=AEX+DQBByQAgACChqGZO6KAWkDm1lwL4B1sqyWvycCRhl8micMlBdSuNUwAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::6815:9af,2606:4700:3037::ac43:a123 |
| www | 104.21.9.175 172.67.161.35 2606:4700:3030::6815:9af 2606:4700:3037::ac43:a123 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network effective-learning.dk: 104.21.9.175 172.67.161.35 2606:4700:3030::6815:9af 2606:4700:3037::ac43:a123 (AS13335) www.effective-learning.dk: 104.21.9.175 172.67.161.35 2606:4700:3030::6815:9af 2606:4700:3037::ac43:a123 (AS13335) |
| Wildcard | No |
| Denial of existence | Compact NSEC (RFC 9824, "black lies") not walkable |
| CDS / CDNSKEY | Delete signal: the zone asks the registry to remove its DS (go insecure) 1 CDS, 1 CDNSKEY |
| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✓ Found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2407150229 |
| Primary NS (MNAME) | aragorn.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Abion AB |
| Registered | 2018-07-16 |
| Expires | 2027-07-31 (285d) |
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).
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-15 11:47:30 | 1240ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-10-03 14:51:06 | 973ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-30 14:46:31 | 954ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-29 14:38:56 | 848ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-09-21 17:24:45 | 1286ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-15 01:26:25 | 842ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-07 12:01:25 | 1648ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-28 13:13:57 | 539ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-24 20:03:14 | 2689ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-08 07:22:15 | 788ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-07-13 05:50:18 | 900ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-24 21:28:51 | 859ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-24 11:42:14 shown | 761ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-19 23:18:07 | 699ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-17 06:16:05 | 10376ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-17 06:06:03 | 1463ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-17 06:02:57 | 308ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-17 06:00:39 | 389ms | 2 NS 2 A 0 MX | 🔓 Insecure |