4b-byg.dk

Records from scan: 2026-10-12 17:04:09 · 1110ms total · last checked 2026-10-15 20:53 (unchanged)

⬇ 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 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 our latest scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.

🖥️ Nameservers#

2 records 30ms

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 35ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
185.21.40.247	60s	linux6.curanet.dk	AS48854	team.blue Denmark A/S	185.21.40.0/22	🇩🇰 Denmark	—

📧 MX Records#

1 records 35ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	300s	4bbyg-dk0e.mail.protection.outlook.com	2a01:111:f403:ca04::10 2a01:111:f403:ca04::f 2a01:111:f403:ca09::22 2a01:111:f403:ca21::e 52.101.68.21 52.101.68.27 52.101.91.153 52.101.91.159	mail-dbapr03cu00100.inbound.protection.outlook.com mail-db7pr03cu00507.inbound.protection.outlook.com mail-am7pr02cu00302.inbound.protection.outlook.com mail-matpr04cu00306.inbound.protection.outlook.com mail-db4pr02cu00205.inbound.protection.outlook.com mail-db7pr03cu00503.inbound.protection.outlook.com mail-matpr04cu00101.inbound.protection.outlook.com mail-matpr04cu00207.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	104.21.52.127

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records#

2 records 64ms

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 183ms

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#

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#

51ms

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

🏷️ SOA#

30ms

Field	Value
Serial	2417228105
Primary NS (MNAME)	gabriella.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

✗ No registration data yet — queued for a WHOIS lookup

📋 WHOIS#

⏱️ Lookup Timing#

30ms

35ms

AAAA

35ms

TXT

183ms

CAA

37ms

HTTPS

36ms

TLSA

664ms

SOA

30ms

MTA-STS

59ms

DNSSEC

51ms

SRV

64ms

Total

1110ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-12 17:04:09 shown	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	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