bt-byg.dk

📜 Historical scan 2026-07-24 10:26:47 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

bt-byg.dk is a .dk domain served by 2 nameservers (ns.nsd.dk, ns2.nsd.dk). It was registered on 7 April 2005 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.21.41.111 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by btbyg-dk0e.mail.protection.outlook.com. The zone is not DNSSEC-signed, 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 46ms

Nameserver	IP addresses	PTR	ASN / ISP
ns.nsd.dk	172.104.147.68	ns.nsd.dk	AS63949 Akamai Connected Cloud
ns2.nsd.dk	62.242.205.2	ns2.nsd.dk	AS3292 TDC Holding A/S

🌍 A Records#

1 records 71ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
185.21.41.111	3600s	linux17.curanet.dk	AS48854	team.blue Denmark A/S	185.21.40.0/22	🇩🇰 Denmark	—

📧 MX Records#

1 records 37ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
20	3600s	btbyg-dk0e.mail.protection.outlook.com	2a01:111:f403:ca04::2 2a01:111:f403:ca04::a 2a01:111:f403:ca04::b 2a01:111:f403:ca09::c 52.101.68.21 52.101.68.36 52.101.73.22 52.101.73.30	mail-du2pr03cu00102.inbound.protection.outlook.com mail-du0pr03cu00102.inbound.protection.outlook.com mail-dbbpr03cu00103.inbound.protection.outlook.com mail-as8pr05cu00304.inbound.protection.outlook.com mail-db4pr02cu00205.inbound.protection.outlook.com mail-db5pr02cu00104.inbound.protection.outlook.com mail-am7pr05cu00106.inbound.protection.outlook.com mail-am7pr05cu00306.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 → 52.97.183.200

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

2 records 300ms

TXT Record
MS=ms50550596
v=spf1 include:spf.protection.outlook.com include:spf.curanet.dk -all

✉️ SPF#

Policy	Record (bt-byg.dk)
-all (hard fail)	v=spf1 include:spf.protection.outlook.com include:spf.curanet.dk -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 2026-10-14 10:47:15

www	185.21.41.111 (AS48854) (address records, no CNAME)
www vs bare domain	Same network bt-byg.dk: 185.21.41.111 (AS48854) www.bt-byg.dk: 185.21.41.111 (AS48854)
Wildcard	No

🔎 SPF check#

zone-wide SPF report

DNS lookups: 4/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

151ms

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

🏷️ SOA#

0ms

Field	Value
Serial	2026072429
Primary NS (MNAME)	ns.nsd.dk
Responsible (RNAME)	admin@ns.nsd.dk
Refresh	10800s
Retry	3600s
Expire	604800s
Minimum (neg-cache TTL)	3600s

📋 Registration#

WHOIS fetched 2026-10-05 19:46:48

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2005-04-07
Expires	2027-04-30 (192d)

📋 WHOIS#

⏱️ Lookup Timing#

46ms

71ms

37ms

AAAA

37ms

TXT

300ms

CAA

76ms

HTTPS

31ms

TLSA

148ms

SOA

0ms

MTA-STS

78ms

DNSSEC

151ms

SRV

293ms

Total

1059ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-14 10:47:15	2078ms	2 NS 1 A 1 MX	🔓 Insecure
2026-10-08 20:20:39	1590ms	2 NS 1 A 1 MX	🔓 Insecure
2026-10-06 20:04:39	1829ms	2 NS 1 A 1 MX	🔓 Insecure
2026-10-05 19:37:34	1710ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-29 18:44:52	1170ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-29 15:02:03	1977ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-28 22:47:12	1374ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-25 21:41:17	1693ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-23 19:14:00	1221ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-17 11:28:32	1673ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-07 21:50:40	1407ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-06 17:58:42	9721ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-03 17:30:21	2371ms	2 NS 1 A 1 MX	🔓 Insecure
2026-08-25 15:54:04	1323ms	2 NS 1 A 1 MX	🔓 Insecure
2026-08-20 20:48:50	6743ms	2 NS 1 A 1 MX	🔓 Insecure
2026-08-18 19:24:12	9368ms	2 NS 1 A 1 MX	🔓 Insecure
2026-08-17 02:05:35	3275ms	2 NS 1 A 1 MX	🔓 Insecure
2026-08-07 04:39:28	1173ms	2 NS 1 A 1 MX	🔓 Insecure
2026-08-04 21:08:14	10061ms	2 NS 1 A 1 MX	🔓 Insecure
2026-07-30 13:05:36	1883ms	2 NS 1 A 1 MX	🔓 Insecure
2026-07-25 10:57:03	9441ms	2 NS 1 A 1 MX	❓ Unknown
2026-07-24 10:26:47 shown	1059ms	2 NS 1 A 1 MX	🔓 Insecure
2026-07-15 10:13:07	1702ms	2 NS 1 A 1 MX	🔓 Insecure
2026-07-08 10:36:03	25288ms	2 NS 1 A 1 MX	❓ Unknown
2026-07-03 15:08:00	1091ms	2 NS 1 A 1 MX	🔓 Insecure