cort.dk

📜 Historical scan 2026-09-12 03:03:02 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

cort.dk is a .dk domain served by 2 nameservers (ns51.gullestrupnet.dk, ns52.gullestrupnet.dk). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 82.165.189.144 is hosted by IONOS SE (AS8560) in Germany. Mail is handled by mail.cort.dk, backupmail.gullestrupnet.dk. The zone is not DNSSEC-signed, 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.

🖥️ Nameservers#

2 records 45ms

Nameserver	IP addresses	PTR	ASN / ISP
ns51.gullestrupnet.dk	82.165.189.144	gn51.gullestrupnet.dk	AS8560 IONOS SE
ns52.gullestrupnet.dk	82.165.203.134	mail51.gullestrupnet.dk	AS8560 IONOS SE

🌍 A Records#

1 records 120ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
82.165.189.144	600s	gn51.gullestrupnet.dk	AS8560	IONOS SE	82.165.0.0/16	🇩🇪 Germany	—

📧 MX Records#

2 records 52ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	600s	mail.cort.dk	82.165.203.134	mail51.gullestrupnet.dk	AS8560 IONOS SE
30	600s	backupmail.gullestrupnet.dk	82.165.203.134	mail51.gullestrupnet.dk	AS8560 IONOS SE

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	82.165.189.144
🔶 Autoconfig	82.165.189.144

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

1 records 1087ms

TXT Record
v=spf1 ip4:82.165.203.134 ip4=82.165.189.144 +a +mx -all

✉️ SPF#

Policy	Record (cort.dk)
-all (hard fail)	v=spf1 ip4:82.165.203.134 ip4=82.165.189.144 +a +mx -all

📨 DMARC#

✗ No DMARC record — mail spoofing not restricted

📬 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#

latest probe, not this scan · checked 2026-10-12 12:56:48

www	82.165.189.144 (AS8560) (address records, no CNAME)
www vs bare domain	Same network cort.dk: 82.165.189.144 (AS8560) www.cort.dk: 82.165.189.144 (AS8560)
Wildcard	Yes: any name under the zone resolves

🔎 SPF check#

zone-wide SPF report

DNS lookups: 2/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

287ms

Check	Result
Validation Status	🔓 Insecure
AD Flag (resolver validates)	✗ Not set
DS Record	✗ Not found
DNSKEY Record	✗ Not found
Flags	unsigned answer

🏷️ SOA#

0ms

Field	Value
Serial	2025102704
Primary NS (MNAME)	ns51.gullestrupnet.dk
Responsible (RNAME)	hostmaster@gullestrupnet.dk
Refresh	10800s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	10800s

📋 Registration#

✗ No registration data yet — queued for a WHOIS lookup

📋 WHOIS#

⏱️ Lookup Timing#

45ms

120ms

52ms

AAAA

43ms

TXT

1087ms

CAA

54ms

HTTPS

57ms

TLSA

93ms

SOA

0ms

MTA-STS

139ms

DNSSEC

287ms

SRV

898ms

Total

1474ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-09-30 14:20:26	1598ms	2 NS 1 A 2 MX	🔓 Insecure
2026-09-12 03:03:02 shown	1474ms	2 NS 1 A 2 MX	🔓 Insecure
2026-06-21 00:04:51	755ms	2 NS 1 A 2 MX	🔓 Insecure
2026-06-16 22:31:14	1863ms	2 NS 1 A 2 MX	🔓 Insecure
2026-06-16 22:30:56	723ms	2 NS 1 A 2 MX	🔓 Insecure