istanbul.dk

📜 Historical scan 2026-06-18 05:25:32 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

istanbul.dk is a .dk domain served by 2 nameservers (a.portsdns.se, b.portsdns.net). It was registered on 7 April 1999 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 178.20.216.181 is hosted by Atea A/S (AS21060) in Denmark. Mail is handled by server.cooperante.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 39ms

Nameserver	IP addresses	PTR	ASN / ISP
a.portsdns.se	2607:f740:e009::1 45.54.35.101	a.portsdns.se a.portsdns.se	AS63911 NetActuate, Inc AS63911 NetActuate, Inc
b.portsdns.net	2a00:11c0:3d::1 94.16.23.1	b.portsdns.net b.portsdns.net	AS42354 Anexia Cloud Solutions GmbH AS42354 Anexia Cloud Solutions GmbH

🌍 A Records#

1 records 56ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
178.20.216.181	—	server.cooperante.dk	AS21060	Atea A/S	178.20.216.0/23	🇩🇰 Denmark	—

📧 MX Records#

1 records 50ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	—	server.cooperante.dk	178.20.216.181	server.cooperante.dk	AS21060 Atea A/S

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	178.20.216.181
🔶 Autoconfig	178.20.216.181

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

1 records 212ms

TXT Record
google-site-verification=eQA4YakQ7sRGBJNLlsfEdGjI2j-nAmnMGhiI_8Ppqlg

✉️ SPF#

✗ No SPF record — mail spoofing not restricted

📨 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 21:31:35

www	178.20.216.181 (AS21060) (address records, no CNAME)
www vs bare domain	Same network istanbul.dk: 178.20.216.181 (AS21060) www.istanbul.dk: 178.20.216.181 (AS21060)
Wildcard	Yes: any name under the zone resolves
Denial of existence	NSEC zone can be walked (all names enumerable)
CDS / CDNSKEY	Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY

🔗 TLSA / DANE#

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

🔐 DNSSEC#

147ms

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

🏷️ SOA#

50ms

Field	Value
Serial	2023111400
Primary NS (MNAME)	a.portsdns.se
Responsible (RNAME)	registry@ports.net
Refresh	10800s
Retry	3600s
Expire	604800s
Minimum (neg-cache TTL)	28800s

📋 Registration#

WHOIS fetched 2026-10-05 03:10:41

Field	Value
Registrar	Simply.com A/S
Registered	1999-04-07
Expires	2027-06-30 (247d)

📋 WHOIS#

⏱️ Lookup Timing#

39ms

56ms

50ms

AAAA

54ms

TXT

212ms

CAA

92ms

HTTPS

60ms

TLSA

76ms

SOA

50ms

MTA-STS

98ms

DNSSEC

147ms

SRV

350ms

Total

705ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-12 21:31:35	809ms	3 NS 1 A 1 MX	🔓 Insecure
2026-10-04 06:42:44	474ms	3 NS 1 A 1 MX	🔓 Insecure
2026-09-13 16:39:41	500ms	3 NS 1 A 1 MX	🔓 Insecure
2026-08-24 21:45:19	463ms	3 NS 1 A 1 MX	🔓 Insecure
2026-06-26 12:55:08	670ms	3 NS 1 A 1 MX	🔓 Insecure
2026-06-24 10:22:50	754ms	3 NS 1 A 1 MX	🔓 Insecure
2026-06-20 19:00:03	850ms	0 NS 0 A 0 MX	❓ Unknown
2026-06-18 05:25:32 shown	705ms	2 NS 1 A 1 MX	🔓 Insecure