double-u.dk

📜 Historical scan 2026-08-10 08:19:42 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

double-u.dk is a .dk domain served by 2 nameservers (diana.ns.cloudflare.com, piers.ns.cloudflare.com). It was registered on 22 September 1999 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.20.205.49 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by mx1.onlinemail.io, mx2.onlinemail.io. 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 204ms

Nameserver	IP addresses	PTR	ASN / ISP
diana.ns.cloudflare.com	108.162.194.23 162.159.38.23 172.64.34.23 2606:4700:50::a29f:2617 2803:f800:50::6ca2:c217 2a06:98c1:50::ac40:2217	diana.ns.cloudflare.com diana.ns.cloudflare.com diana.ns.cloudflare.com diana.ns.cloudflare.com diana.ns.cloudflare.com diana.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
piers.ns.cloudflare.com	108.162.195.16 162.159.44.16 172.64.35.16 2606:4700:58::a29f:2c10 2803:f800:50::6ca2:c310 2a06:98c1:50::ac40:2310	piers.ns.cloudflare.com piers.ns.cloudflare.com piers.ns.cloudflare.com piers.ns.cloudflare.com piers.ns.cloudflare.com piers.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 196ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
185.20.205.49	3600s	linux375.unoeuro.com	AS48854	team.blue Denmark A/S	185.20.204.0/22	🇩🇰 Denmark	—

📧 MX Records#

2 records 202ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	3600s	mx1.onlinemail.io	185.21.42.12	mx1.onlinemail.io	AS48854 team.blue Denmark A/S
20	3600s	mx2.onlinemail.io	46.36.208.16	mx2.onlinemail.io	AS48854 team.blue Denmark A/S

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	autodiscover-mf.onlinemail.io → 185.21.40.62
🔶 Autoconfig	autoconfig-mf.onlinemail.io → 185.21.40.62

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

2 records 589ms

TXT Record
google-site-verification=BbM7nffrzgpD1L6EyAY6-qHq9zMZM2KHOeSECcXSu74
v=spf1 include:spf.onlinemail.io -all

✉️ SPF#

Policy	Record (double-u.dk)
-all (hard fail)	v=spf1 include:spf.onlinemail.io -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 2026-10-08 01:48:15

www CNAME	double-u.dk (all on double-u.dk) → 185.20.205.49 (AS48854)
www vs bare domain	Same network double-u.dk: 185.20.205.49 (AS48854) www.double-u.dk: 185.20.205.49 (AS48854)
Wildcard	No

🔎 SPF check#

zone-wide SPF report

DNS lookups: 3/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

386ms

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	2411735197
Primary NS (MNAME)	diana.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-17 10:48:42

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	1999-09-22
Expires	2027-09-30 (347d)

🔗 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#

204ms

196ms

202ms

AAAA

188ms

TXT

589ms

CAA

187ms

HTTPS

216ms

TLSA

420ms

SOA

0ms

MTA-STS

253ms

DNSSEC

386ms

SRV

252ms

Total

2892ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-08 01:48:15	991ms	2 NS 1 A 2 MX	🔓 Insecure
2026-09-25 21:25:50	2414ms	2 NS 1 A 2 MX	🔓 Insecure
2026-09-24 00:48:11	622ms	2 NS 1 A 2 MX	🔓 Insecure
2026-08-10 08:19:42 shown	2892ms	2 NS 1 A 2 MX	🔓 Insecure
2026-07-27 00:39:33	2905ms	2 NS 1 A 2 MX	🔓 Insecure
2026-06-19 23:32:01	510ms	2 NS 1 A 2 MX	🔓 Insecure
2026-06-17 04:21:15	549ms	2 NS 1 A 2 MX	🔓 Insecure
2026-06-17 04:20:21	424ms	2 NS 1 A 2 MX	🔓 Insecure