ack.dk is a .dk domain served by 2 nameservers (duke.ns.cloudflare.com, kiki.ns.cloudflare.com). It was registered on 19 April 2017 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.30.245 is hosted by Cloudflare, Inc. (AS13335). The zone is not DNSSEC-signed, 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 |
|---|---|---|---|---|---|---|---|
| 104.21.30.245 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.174.54 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3032::6815:1ef5 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::ac43:ae36 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.30.245,172.67.174.54 ech=AEX+DQBBJAAgACCkYKjF+PgzRLOwW+2yr8astz47Bu7VJ8tl+TZMFjzhSQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3032::6815:1ef5,2606:4700:3037::ac43:ae36 |
| TXT Record |
|---|
| v=spf1 mx a ip4:84.19.174.8 ~all |
| Policy | Record (ack.dk) |
|---|---|
| ~all (soft fail) | v=spf1 mx a ip4:84.19.174.8 ~all |
| Policy | Record (_dmarc.ack.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:martin@zakobo.dk; ruf=mailto:martin@zakobo.dk; fo=0:1:d:s; adkim=s; aspf=s |
| www | 104.21.30.245 172.67.174.54 2606:4700:3032::6815:1ef5 2606:4700:3037::ac43:ae36 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
DNS lookups: 2/10 · policy: ~all
No problems found| 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 | 2412714572 |
| Primary NS (MNAME) | duke.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 | 2017-04-19 |
| Expires | 2027-04-30 (195d) |
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 |
|---|---|
| ack-allerod.dk | Punktum dk A/S (direct) |
| allerodtour.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-04 11:51:52 | 433ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-29 17:54:11 | 505ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-24 04:44:51 | 821ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-28 09:41:21 | 913ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-28 09:41:11 | 3651ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-21 12:55:55 shown | 3527ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-07-25 04:49:49 | 720ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-24 18:40:46 | 849ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-22 01:05:01 | 498ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-16 12:37:27 | 488ms | 2 NS 2 A 0 MX | 🔓 Insecure |