clt.dk

Records from scan: 2026-10-14 11:56:24 · 1394ms total · last checked 2026-10-16 13:47 (unchanged)

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

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 our latest scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.

🖥️ Nameservers#

2 records 124ms

Nameserver	IP addresses	PTR	ASN / ISP
cris.ns.cloudflare.com	108.162.195.202 162.159.44.202 172.64.35.202 2606:4700:58::a29f:2cca 2803:f800:50::6ca2:c3ca 2a06:98c1:50::ac40:23ca	cris.ns.cloudflare.com cris.ns.cloudflare.com cris.ns.cloudflare.com cris.ns.cloudflare.com cris.ns.cloudflare.com cris.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
liberty.ns.cloudflare.com	108.162.194.240 162.159.38.240 172.64.34.240 2606:4700:50::a29f:26f0 2803:f800:50::6ca2:c2f0 2a06:98c1:50::ac40:22f0	liberty.ns.cloudflare.com liberty.ns.cloudflare.com liberty.ns.cloudflare.com liberty.ns.cloudflare.com liberty.ns.cloudflare.com liberty.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.

🌍 A Records#

1 records 124ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
188.228.89.108	120s	188.228.89.108.dynamic.altibox.net	AS214875	Altibox Danmark AS	188.228.88.0/22	🇩🇰 Denmark	Holstebro

📧 MX Records#

2 records 146ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	120s	mail.clt.dk	188.228.89.108	188.228.89.108.dynamic.altibox.net	AS214875 Altibox Danmark AS
20	120s	mxbackup.gratisdns.dk	—	—	—

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	clt.dk → 188.228.89.108
🔶 Autoconfig	clt.dk → 188.228.89.108

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records#

1 records 180ms

Service	Priority	Weight	Port	Target
_autodiscover._tcp	10	20	443	mail.clt.dk

📝 TXT Records#

2 records 374ms

TXT Record
google-site-verification=RmOTO6K11ZYc0TiusBryuxApH9DaQJAAT1aOAGkh5lw
v=spf1 ip4:188.228.89.108 ~all

✉️ SPF#

Policy	Record (clt.dk)
~all (soft fail)	v=spf1 ip4:188.228.89.108 ~all

📨 DMARC#

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

📬 MTA-STS#

✗ No MTA-STS policy — SMTP TLS not enforced

📈 TLSRPT#

✗ No TLSRPT record — no SMTP TLS failure reporting

📜 CAA Records#

✗ No CAA records — any CA may issue certificates

🧩 Web & zone#

checked 2026-10-14 11:56:24

www	188.228.89.108 (AS214875) (address records, no CNAME)
www vs bare domain	Same network clt.dk: 188.228.89.108 (AS214875) www.clt.dk: 188.228.89.108 (AS214875)
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

🔎 SPF check#

zone-wide SPF report

DNS lookups: 0/10 · policy: ~all

No problems found

🔏 ACME Challenge#

Type	Name	Value
TXT	_acme-challenge.clt.dk	MpCkBUcfU8yybbcn0YNLFJYAXwdLqfTj5Q02yE50wII

🔗 TLSA / DANE#

✗ No TLSA records — DANE not configured for HTTPS (_443) or MX (_25)

🔐 DNSSEC#

226ms

Check	Result
Validation Status	🔒 Secure
AD Flag (resolver validates)	✓ Set
DS Record	✓ Found
DNSKEY Record	✓ Found
Flags	fully validated

🏷️ SOA#

92ms

Field	Value
Serial	2417443509
Primary NS (MNAME)	cris.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-11 11:51:05

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2004-09-22
Expires	2029-09-30 (1079d)

🔗 Same registrant#

0 domains

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

📋 WHOIS#

⏱️ Lookup Timing#

124ms

146ms

AAAA

122ms

TXT

374ms

CAA

120ms

HTTPS

120ms

TLSA

352ms

SOA

92ms

MTA-STS

173ms

DNSSEC

226ms

SRV

180ms

Total

1394ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-14 11:56:24 shown	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	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