kool.dk is a .dk domain served by 2 nameservers (mona.ns.cloudflare.com, stan.ns.cloudflare.com). It was registered on 13 November 2001 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.85.143 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by isaac.mx.cloudflare.net, amir.mx.cloudflare.net and 1 more. The zone is DNSSEC-signed but currently fails validation, publishes a 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 |
|---|---|---|---|---|---|---|---|
| 104.21.85.143 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.206.168 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3031::6815:558f | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3033::ac43:cea8 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=188.114.96.1,188.114.97.1 ech=AEX+DQBBswAgACCtzfl+JLJmLUjZC1ZCnYHzuwbLlQguO5mcGuxGsJs9PwAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2a06:98c1:3120::1,2a06:98c1:3121::1 |
| TXT Record |
|---|
| v=spf1 include:_spf.mx.cloudflare.net include:_spf.google.com ~all |
| Policy | Record (kool.dk) |
|---|---|
| ~all (soft fail) | v=spf1 include:_spf.mx.cloudflare.net include:_spf.google.com ~all |
| Policy | Record (_dmarc.kool.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; pct=100 |
| www CNAME | duff.dk (all on duff.dk) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | Compact NSEC (RFC 9824, "black lies") not walkable |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
DNS lookups: 2/10 · policy: ~all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.amir.mx.cloudflare.net | DANE-TA · SPKI · SHA-256 | 59E738E674221702AF1EDB87C5200C1A… |
| SMTP _25._tcp.amir.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 0F0C6C164A36F97E7B4C5A5B69D6F4F2… |
| SMTP _25._tcp.amir.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 9BE5B7D47F9EFF930C11EB04D27CAE6B… |
| SMTP _25._tcp.isaac.mx.cloudflare.net | DANE-TA · SPKI · SHA-256 | 59E738E674221702AF1EDB87C5200C1A… |
| SMTP _25._tcp.isaac.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 0F0C6C164A36F97E7B4C5A5B69D6F4F2… |
| SMTP _25._tcp.isaac.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 9BE5B7D47F9EFF930C11EB04D27CAE6B… |
| SMTP _25._tcp.linda.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 0F0C6C164A36F97E7B4C5A5B69D6F4F2… |
| SMTP _25._tcp.linda.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 9BE5B7D47F9EFF930C11EB04D27CAE6B… |
| SMTP _25._tcp.linda.mx.cloudflare.net | DANE-TA · SPKI · SHA-256 | 59E738E674221702AF1EDB87C5200C1A… |
| Check | Result |
|---|---|
| Validation Status | ⚠️ Bogus |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✓ Found |
| Flags | broken trust chain resolving 'kool.dk/DNSKEY/IN': 127.0.0.1#53 |
| Field | Value |
|---|---|
| Serial | 2407072799 |
| Primary NS (MNAME) | mona.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 | 2001-11-13 |
| Expires | 2026-12-31 (71d) |
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 |
|---|---|
| duff.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-15 07:14:58 | 712ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-10-05 01:44:59 | 3578ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-10-04 01:36:58 | 1389ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-10-02 01:30:42 | 671ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-10-01 01:09:46 | 1134ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-28 00:16:26 | 920ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-25 22:32:00 | 1165ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-23 22:16:37 | 1070ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-14 19:03:48 | 2547ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-07 15:40:28 | 2414ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-27 18:27:49 | 829ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-27 18:24:42 | 1691ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-08 03:48:23 | 1770ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-07-15 04:42:03 | 2203ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-07-11 17:20:17 | 9409ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-28 18:54:35 | 1276ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-20 16:20:47 shown | 3879ms | 2 NS 2 A 3 MX | ⚠️ Bogus |
| 2026-06-18 03:55:59 | 1219ms | 2 NS 2 A 3 MX | 🔒 Secure |