clt.dk is a .dk domain served by 2 nameservers (cris.ns.cloudflare.com, liberty.ns.cloudflare.com). It was registered on 22 September 2004 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 188.228.89.108 is hosted by Altibox Danmark AS (AS214875) in Denmark. Mail is handled by mail.clt.dk, mxbackup.gratisdns.dk. The zone is DNSSEC-signed and validates, publishes a 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 |
|---|---|---|---|---|---|---|---|
| 188.228.89.108 | 300s | 188.228.89.108.dynamic.altibox.net | AS214875 | Altibox Danmark AS | 188.228.88.0/22 | 🇩🇰 Denmark | Holstebro |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 300s | mail.clt.dk | 188.228.89.108 | 188.228.89.108.dynamic.altibox.net | AS214875 Altibox Danmark AS |
| 20 | 300s | mxbackup.gratisdns.dk | — | — | — |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 10 | 20 | 443 | mail.clt.dk |
| TXT Record |
|---|
| google-site-verification=RmOTO6K11ZYc0TiusBryuxApH9DaQJAAT1aOAGkh5lw |
| v=spf1 ip4:188.228.89.108 ~all |
| Policy | Record (clt.dk) |
|---|---|
| ~all (soft fail) | v=spf1 ip4:188.228.89.108 ~all |
| Policy | Record (_dmarc.clt.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; rua=mailto:claus+aggr@clt.dk; ruf=mailto:claus+forensic@clt.dk; adkim=r; aspf=r; pct=100; rf=afrf; sp=none |
| www | 188.228.89.108 (AS214875) (address records, no CNAME) |
| 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: 0/10 · policy: ~all
No problems found| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.clt.dk | MpCkBUcfU8yybbcn0YNLFJYAXwdLqfTj5Q02yE50wII |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2407229255 |
| Primary NS (MNAME) | cris.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 | 2004-09-22 |
| Expires | 2029-09-30 (1079d) |
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).
No other domain with this registrant in our WHOIS data yet| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-14 11:56:24 | 1394ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-27 14:44:35 | 704ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-26 14:32:40 | 1342ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-21 11:02:55 | 1124ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-14 09:26:23 | 10970ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-27 10:36:07 | 1782ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-16 07:11:56 | 4898ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-03 11:58:16 | 1277ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-29 11:58:17 | 2937ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-09 21:21:36 | 9221ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-03 05:48:44 | 1137ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-26 09:12:24 | 3008ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-25 00:27:47 shown | 973ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-24 02:13:34 | 1194ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-22 02:06:00 | 580ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-21 03:36:09 | 1050ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-16 21:25:39 | 2587ms | 2 NS 1 A 2 MX | 🔒 Secure |