4b.dk

📜 Historical scan 2026-06-29 10:20:36 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

4b.dk is a .dk domain served by 2 nameservers (ns.scannet2.dk, ns2.scannet2.dk). It was registered on 24 March 1998 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.21.43.11 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by 4b-dk.mail.protection.outlook.com. The zone is DNSSEC-signed and validates, 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 29ms

Nameserver	IP addresses	PTR	ASN / ISP
ns.scannet2.dk	185.25.141.9 2a02:2339:4006:10d::4171:4171	ns1.scannet.dk ns1.scannet.dk	AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S
ns2.scannet2.dk	2a02:2339:1:112:0:5:1:b11 91.197.248.72	ns2.scannet.dk ns2.scannet.dk	AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S

🌍 A Records#

1 records 29ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
185.21.43.11	3600s	linux11.scannet.dk	AS48854	team.blue Denmark A/S	185.21.40.0/22	🇩🇰 Denmark	—

📧 MX Records#

1 records 34ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	600s	4b-dk.mail.protection.outlook.com	2a01:111:f403:ca04::2 2a01:111:f403:ca04::b 2a01:111:f403:ca09::3 2a01:111:f403:ca09::e 52.101.68.12 52.101.68.32 52.101.73.11 52.101.73.8	mail-du2pr03cu00102.inbound.protection.outlook.com mail-dbbpr03cu00103.inbound.protection.outlook.com mail-am6pr04cu00303.inbound.protection.outlook.com mail-am7pr05cu00206.inbound.protection.outlook.com mail-db9pr02cu00204.inbound.protection.outlook.com mail-db3pr0202cu00200.inbound.protection.outlook.com mail-am1pr04cu00103.inbound.protection.outlook.com mail-am0pr04cu00500.inbound.protection.outlook.com	AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	autodiscover.outlook.com → 40.104.116.40

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records#

1 records 38ms

Service	Priority	Weight	Port	Target
_sipfederationtls._tcp	0	100	5061	sipfed.online.lync.com

📝 TXT Records#

5 records 134ms

TXT Record
_globalsign-domain-verification=0c0HCdJDXk0hisMXTISSPPye-P9K26uE6OlQadXxK-
_globalsign-domain-verification=juivoWS4y5o27vxgZzwUDerzQPax6bfTmJLDmVn7eX
MS=ms37384634
P-b492TBVmzz
v=spf1 ip4:91.215.163.163 ip4:79.142.235.115 ip4:185.157.16.136 include:spf.protection.outlook.com include:spf.comendosystems.com include:spf.zentura.dk include:spf-de.emailsignatures365.com include:spf.permido.com -all

✉️ SPF#

Policy	Record (4b.dk)
-all (hard fail)	v=spf1 ip4:91.215.163.163 ip4:79.142.235.115 ip4:185.157.16.136 include:spf.protection.outlook.com include:spf.comendosystems.com include:spf.zentura.dk include:spf-de.emailsignatures365.com include:spf.permido.com -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 10:08:24

www	185.21.43.11 (AS48854) (address records, no CNAME)
www vs bare domain	Same network 4b.dk: 185.21.43.11 (AS48854) www.4b.dk: 185.21.43.11 (AS48854)
Wildcard	No
Denial of existence	NSEC3 · 1 iteration · 1-byte salt RFC 9276 recommends 0 iterations and no salt
CDS / CDNSKEY	None 0 CDS, 0 CDNSKEY

🔎 SPF check#

zone-wide SPF report

DNS lookups: 8/10 · policy: -all

warn 8 of the 10 allowed DNS lookups used: one more include can break SPF

🔗 TLSA / DANE#

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

🔐 DNSSEC#

56ms

Check	Result
Validation Status	🔒 Secure
AD Flag (resolver validates)	✓ Set
DS Record	✓ Found
DNSKEY Record	✓ Found
Flags	fully validated

🏷️ SOA#

27ms

Field	Value
Serial	2024090301
Primary NS (MNAME)	ns.scannet2.dk
Responsible (RNAME)	hostmaster@scannet.dk
Refresh	14400s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	300s

📋 Registration#

WHOIS fetched 2026-10-14 17:29:52

Field	Value
Registrar	A/S SCANNET
Registered	1998-03-24
Expires	2027-03-31 (165d)

🔗 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
tavastehus.dk	Punktum dk A/S (direct)

📋 WHOIS#

⏱️ Lookup Timing#

29ms

34ms

AAAA

34ms

TXT

134ms

CAA

31ms

HTTPS

27ms

TLSA

131ms

SOA

27ms

MTA-STS

33ms

DNSSEC

56ms

SRV

38ms

Total

727ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-09-30 19:43:23	1071ms	2 NS 1 A 1 MX	🔒 Secure
2026-09-25 10:22:56	738ms	2 NS 1 A 1 MX	🔒 Secure
2026-09-02 21:02:59	925ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-29 10:20:36 shown	727ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-25 20:53:16	1226ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-25 15:23:39	1694ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-20 21:51:17	1606ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-16 12:43:55	942ms	2 NS 1 A 1 MX	🔒 Secure