4b-byg.dk

📜 Historical scan 2026-06-26 08:23:32 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

4b-byg.dk is a .dk domain served by 2 nameservers (gabriella.ns.cloudflare.com, mitch.ns.cloudflare.com). It was registered on 31 May 2000 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.21.40.247 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by 4bbyg-dk0e.mail.protection.outlook.com. The zone is not DNSSEC-signed, publishes a 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 46ms

Nameserver	IP addresses	PTR	ASN / ISP
gabriella.ns.cloudflare.com	108.162.194.134 162.159.38.134 172.64.34.134 2606:4700:50::a29f:2686 2803:f800:50::6ca2:c286 2a06:98c1:50::ac40:2286	gabriella.ns.cloudflare.com gabriella.ns.cloudflare.com gabriella.ns.cloudflare.com gabriella.ns.cloudflare.com gabriella.ns.cloudflare.com gabriella.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
mitch.ns.cloudflare.com	108.162.193.208 172.64.33.208 173.245.59.208 2606:4700:58::adf5:3bd0 2803:f800:50::6ca2:c1d0 2a06:98c1:50::ac40:21d0	mitch.ns.cloudflare.com mitch.ns.cloudflare.com mitch.ns.cloudflare.com mitch.ns.cloudflare.com mitch.ns.cloudflare.com mitch.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 39ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
185.21.40.247	300s	linux6.curanet.dk	AS48854	team.blue Denmark A/S	185.21.40.0/22	🇩🇰 Denmark	—

📧 MX Records#

1 records 40ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	300s	4bbyg-dk0e.mail.protection.outlook.com	2a01:111:f403:ca04:: 2a01:111:f403:ca04::9 2a01:111:f403:ca04::a 2a01:111:f403:ca09::3 52.101.68.15 52.101.68.21 52.101.73.24 52.101.73.8	mail-db3pr0202cu00100.inbound.protection.outlook.com mail-db7pr03cu00601.inbound.protection.outlook.com mail-du0pr03cu00102.inbound.protection.outlook.com mail-am6pr04cu00303.inbound.protection.outlook.com mail-db6pr03cu00107.inbound.protection.outlook.com mail-db4pr02cu00205.inbound.protection.outlook.com mail-as8pr05cu00300.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	104.21.52.127
🔶 Autoconfig	172.67.199.59

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records#

2 records 87ms

Service	Priority	Weight	Port	Target
_autodiscover._tcp	0	0	443	cpanelemaildiscovery.cpanel.net
_sipfederationtls._tcp	100	1	5061	sipfed.online.lync.com

📝 TXT Records#

1 records 156ms

TXT Record
v=spf1 ip4:213.184.85.12 include:spf-record.net include:spf.protection.outlook.com -all

✉️ SPF#

Policy	Record (4b-byg.dk)
-all (hard fail)	v=spf1 ip4:213.184.85.12 include:spf-record.net include:spf.protection.outlook.com -all

📨 DMARC#

Policy	Record (_dmarc.4b-byg.dk)
p=none (monitor only)	v=DMARC1; p=none;

📬 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 17:04:09

www	185.21.40.247 (AS48854) (address records, no CNAME)
www vs bare domain	Same network 4b-byg.dk: 185.21.40.247 (AS48854) www.4b-byg.dk: 185.21.40.247 (AS48854)
Wildcard	No

✍️ DKIM keys#

2 found

Selector	CNAME	Key
s1	s1.domainkey.u51273721.wl222.sendgrid.net	RSA · ~2048 bit
s2	s2.domainkey.u51273721.wl222.sendgrid.net	RSA · ~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: 3/10 · policy: -all

No problems found

🔏 ACME Challenge#

Type	Name	Value
TXT	_acme-challenge.4b-byg.dk	K-BIlgfqmlDM1rF3i9GgD_z9_RIuxS2KR_rC6UDdvMI

🔗 TLSA / DANE#

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

🔐 DNSSEC#

108ms

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

🏷️ SOA#

46ms

Field	Value
Serial	2406797604
Primary NS (MNAME)	gabriella.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-16 21:40:49

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2000-05-31
Expires	2027-06-30 (256d)

🔗 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#

46ms

39ms

40ms

AAAA

41ms

TXT

156ms

CAA

44ms

HTTPS

44ms

TLSA

253ms

SOA

46ms

MTA-STS

56ms

DNSSEC

108ms

SRV

87ms

Total

1047ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-12 17:04:09	1110ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-30 06:06:38	1071ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-17 21:14:30	1058ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-15 23:11:32	2190ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-05 06:51:43	3110ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-02 18:27:18	1702ms	2 NS 1 A 1 MX	🔓 Insecure
2026-08-26 22:32:05	1137ms	2 NS 1 A 1 MX	🔓 Insecure
2026-08-25 09:50:19	7686ms	2 NS 1 A 1 MX	🔓 Insecure
2026-08-13 10:57:33	2002ms	2 NS 1 A 1 MX	🔓 Insecure
2026-07-16 13:34:55	1965ms	2 NS 1 A 1 MX	🔓 Insecure
2026-06-26 08:23:32 shown	1047ms	2 NS 1 A 1 MX	🔓 Insecure
2026-06-23 15:44:22	1152ms	0 NS 0 A 0 MX	❓ Unknown
2026-06-16 12:38:16	4620ms	2 NS 1 A 1 MX	🔓 Insecure