b4u.dk

📜 Historical scan 2026-06-25 07:44:23 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

b4u.dk is a .dk domain served by 2 nameservers (odin.ns.cloudflare.com, olga.ns.cloudflare.com). It was registered on 22 December 2024 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.25.24 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by smtp.b4u.dk, mail1.b4u.dk and 2 more. The zone is not DNSSEC-signed, publishes a DMARC policy and is reachable over IPv6. 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 56ms

Nameserver	IP addresses	PTR	ASN / ISP
odin.ns.cloudflare.com	108.162.195.208 162.159.44.208 172.64.35.208 2606:4700:58::a29f:2cd0 2803:f800:50::6ca2:c3d0 2a06:98c1:50::ac40:23d0	odin.ns.cloudflare.com odin.ns.cloudflare.com odin.ns.cloudflare.com odin.ns.cloudflare.com odin.ns.cloudflare.com odin.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
olga.ns.cloudflare.com	108.162.192.137 172.64.32.137 173.245.58.137 2606:4700:50::adf5:3a89 2803:f800:50::6ca2:c089 2a06:98c1:50::ac40:2089	olga.ns.cloudflare.com olga.ns.cloudflare.com olga.ns.cloudflare.com olga.ns.cloudflare.com olga.ns.cloudflare.com olga.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.

🌍 A Records#

2 records 32ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.25.24	600s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.222.10	600s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

4 records 35ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	600s	smtp.b4u.dk	62.164.213.156	vmi2345123.contaboserver.net	AS51167 Contabo GmbH
20	600s	mail1.b4u.dk	144.91.107.31	vmi2946224.contaboserver.net	AS51167 Contabo GmbH
40	600s	mxa.eu.mailgun.org	34.111.130.244	244.130.111.34.bc.googleusercontent.com	AS396982 Google LLC
50	600s	mxb.eu.mailgun.org	34.111.130.244	244.130.111.34.bc.googleusercontent.com	AS396982 Google LLC

🔷 AAAA Records (IPv6)#

2 records 36ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3033::ac43:de0a	600s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3035::6815:1918	600s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 101ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.25.24,172.67.222.10 ech=AEX+DQBBYAAgACAxrvh6uO+lluAfM5nQnCLjW61wH96yeAzBiWzsEOacfAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3033::ac43:de0a,2606:4700:3035::6815:1918

📝 TXT Records#

1 records 164ms

TXT Record
v=spf1 +mx +a include:mailgun.org ~all

✉️ SPF#

Policy	Record (b4u.dk)
~all (soft fail)	v=spf1 +mx +a include:mailgun.org ~all

📨 DMARC#

Policy	Record (_dmarc.b4u.dk)
p=quarantine	v=DMARC1;p=quarantine;rua=mailto:admin@b4u.dk;

📬 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 2026-10-09 08:50:16

www	104.21.25.24 172.67.222.10 2606:4700:3033::ac43:de0a 2606:4700:3035::6815:1918 (AS13335) (address records, no CNAME)
www vs bare domain	Same network b4u.dk: 104.21.25.24 172.67.222.10 2606:4700:3033::ac43:de0a 2606:4700:3035::6815:1918 (AS13335) www.b4u.dk: 104.21.25.24 172.67.222.10 2606:4700:3033::ac43:de0a 2606:4700:3035::6815:1918 (AS13335)
Wildcard	No

✍️ DKIM keys#

1 found

Selector	CNAME	Key
default	—	RSA · ~1024 bit below 2048 bit

DKIM selectors can't be listed, so we check the common ones (Microsoft 365, Google, Mailchimp, SendGrid, generic). Keys under other selectors aren't shown.

🔎 SPF check#

zone-wide SPF report

DNS lookups: 7/10 · policy: ~all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

65ms

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

🏷️ SOA#

54ms

Field	Value
Serial	2406077679
Primary NS (MNAME)	odin.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-15 11:20:25

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2024-12-22
Expires	2026-12-21 (64d)

🔗 Same registrant#

1 domain

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).

Domain	Registrar
baagøeperformance.dk	Punktum dk A/S (direct)

📋 WHOIS#

⏱️ Lookup Timing#

56ms

32ms

35ms

AAAA

36ms

TXT

164ms

CAA

34ms

HTTPS

101ms

TLSA

376ms

SOA

54ms

MTA-STS

35ms

DNSSEC

65ms

SRV

102ms

Total

1405ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-09-30 02:36:43	1234ms	2 NS 2 A 4 MX	🔓 Insecure
2026-09-28 01:58:42	9862ms	2 NS 2 A 4 MX	🔓 Insecure
2026-09-17 12:39:55	1273ms	2 NS 2 A 4 MX	🔓 Insecure
2026-09-07 00:31:12	2353ms	2 NS 2 A 4 MX	🔓 Insecure
2026-08-29 21:07:09	761ms	2 NS 2 A 4 MX	🔓 Insecure
2026-08-07 04:13:04	2051ms	2 NS 2 A 4 MX	🔓 Insecure
2026-07-18 13:11:17	1632ms	2 NS 2 A 4 MX	❓ Unknown
2026-07-03 18:49:28	1356ms	2 NS 2 A 4 MX	🔓 Insecure
2026-07-02 11:46:08	5469ms	2 NS 2 A 4 MX	🔓 Insecure
2026-06-25 07:44:23 shown	1405ms	2 NS 2 A 4 MX	🔓 Insecure
2026-06-21 11:20:37	880ms	2 NS 2 A 4 MX	🔓 Insecure
2026-06-16 13:57:35	2737ms	2 NS 2 A 4 MX	🔓 Insecure