b4u.dk DNS records

🖥️ Nameservers2 records 34ms

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 Records2 records 33ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.25.24	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.222.10	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records4 records 32ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	300s	smtp.b4u.dk	62.164.213.156	vmi2345123.contaboserver.net	AS51167 Contabo GmbH
20	300s	mail1.b4u.dk	144.91.107.31	vmi2946224.contaboserver.net	AS51167 Contabo GmbH
40	300s	mxa.eu.mailgun.org	34.111.130.244	244.130.111.34.bc.googleusercontent.com	AS396982 Google LLC
50	300s	mxb.eu.mailgun.org	34.111.130.244	244.130.111.34.bc.googleusercontent.com	AS396982 Google LLC

🔷 AAAA Records (IPv6)2 records 23ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3033::ac43:de0a	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3035::6815:1918	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records1 records 36ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.25.24,172.67.222.10 ech=AEX+DQBBTwAgACBkZm1uIY+/MIQZO/yAHC66UncshenTZuuMNcRj9Z1FdAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3033::ac43:de0a,2606:4700:3035::6815:1918

📝 TXT Records1 records 134ms

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

🔗 TLSA / DANE

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

🔐 DNSSEC101ms

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

🏷️ SOA0ms

Field	Value
Serial	2413436508
Primary NS (MNAME)	odin.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration

✗ No registration data — collected automatically when SOA serial changes

📋 WHOIS

⏱️ Lookup Timing

NS

34ms

A

33ms

MX

32ms

AAAA

23ms

TXT

134ms

CAA

36ms

HTTPS

36ms

TLSA

118ms

SOA

0ms

MTA-STS

41ms

DNSSEC

101ms

SRV

43ms

Total

761ms

🕐 Scan History

Scanned At	Duration	Records	DNSSEC
2026-08-29 21:07:09	761ms	2 NS 2 A 4 MX	🔓 Insecure	View
2026-08-07 04:13:04	2051ms	2 NS 2 A 4 MX	🔓 Insecure	View
2026-07-18 13:11:17	1632ms	2 NS 2 A 4 MX	❓ Unknown	View
2026-07-03 18:49:28	1356ms	2 NS 2 A 4 MX	🔓 Insecure	View
2026-07-02 11:46:08	5469ms	2 NS 2 A 4 MX	🔓 Insecure	View
2026-06-25 07:44:23	1405ms	2 NS 2 A 4 MX	🔓 Insecure	View
2026-06-21 11:20:37	880ms	2 NS 2 A 4 MX	🔓 Insecure	View
2026-06-16 13:57:35	2737ms	2 NS 2 A 4 MX	🔓 Insecure	View