tac.dk is a .dk domain served by 2 nameservers (hattie.ns.cloudflare.com, henrik.ns.cloudflare.com). It was registered on 16 June 1994 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 89.23.224.28 is hosted by Fiberby ApS (AS42541) in Denmark. The zone is DNSSEC-signed and validates, has no DMARC policy and has no IPv6 address. 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 |
|---|---|---|---|---|---|---|---|
| 89.23.224.28 | 300s | carrier-grade-nat-ip-029.vgcar3.cgn.fiberby.net | AS42541 | Fiberby ApS | 89.23.224.0/19 | 🇩🇰 Denmark | Copenhagen |
| www | Exists, no address |
| www vs bare domain | www does not resolve tac.dk: 104.21.52.46 172.67.195.96 2a06:98c1:3120::1 2a06:98c1:3121::1 (AS13335) (all like this)www.tac.dk: no address |
| 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 |
| Selector | CNAME | Key |
|---|---|---|
| default | — | RSA Invalid key data — receivers can't verify signatures |
DKIM selectors can't be listed, so we check the common ones (Microsoft 365, Google, Mailchimp, SendGrid, generic). Keys under other selectors aren't shown.
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2407403914 |
| Primary NS (MNAME) | hattie.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 | 1994-06-16 |
| Expires | 2028-06-30 (620d) |
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 |
|---|---|---|---|
| 2026-10-14 05:53:41 | 572ms | 2 NS 2 A 4 MX | 🔒 Secure |
| 2026-10-08 11:52:53 | 3154ms | 2 NS 2 A 4 MX | 🔒 Secure |
| 2026-10-03 08:13:42 | 665ms | 2 NS 2 A 4 MX | 🔒 Secure |
| 2026-09-28 14:59:44 | 948ms | 2 NS 2 A 4 MX | 🔒 Secure |
| 2026-09-27 14:50:50 | 828ms | 2 NS 2 A 4 MX | 🔒 Secure |
| 2026-09-21 22:50:12 | 928ms | 2 NS 2 A 4 MX | 🔒 Secure |
| 2026-09-07 22:35:59 | 1428ms | 2 NS 2 A 4 MX | 🔒 Secure |
| 2026-08-20 11:54:16 | 974ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-08-17 05:40:30 | 3128ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-08-11 05:09:45 | 2135ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-08-07 21:23:15 | 1173ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-07-29 07:50:53 | 1594ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-07-23 23:51:05 | 1745ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-07-17 22:55:49 | 1059ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-06-30 02:30:28 | 1014ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-06-25 16:27:22 | 990ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-06-20 16:51:44 shown | 782ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-06-19 17:53:37 | 514ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-06-17 17:43:41 | 717ms | 2 NS 1 A 0 MX | 🔒 Secure |