guehring.dk DNS records

🖥️ Nameservers5 records 53ms

Nameserver	IP addresses	PTR	ASN / ISP
ns.gbc.gmbh	49.12.121.173	ns.gbc.gmbh	AS24940 Hetzner Online GmbH
ns.gbc.green	192.174.68.104 2001:67c:1bc::104	a.xnameserver.de ns.inwx.es	AS1921 ipcom GmbH AS1921 ipcom GmbH
ns.gbc.jetzt	2a02:d500::53 45.87.158.53	c.xnameserver.de ns.domrobot.org	AS48596 InterNetworX Management GmbH AS48596 InterNetworX Management GmbH
ns.gbc.red	176.97.158.104 2001:67c:10b8::104	ns2.anycastdns.ch ns2.inwx.net	AS207021 ipcom GmbH AS207021 ipcom GmbH
ns.gbc.systems	212.97.96.154	ns.gbc.systems	AS24766 GBC GmbH Internet Service Center Ingenieurgesellschaft fuer Systemsoftware und Kommunikation

🌍 A Records1 records 41ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
212.97.109.233	3600s	guehring02.gbc.systems	AS24766	GBC GmbH Internet Service Center Ingenieurgesellschaft fuer Systemsoftware und Kommunikation	212.97.96.0/19	🇩🇪 Germany	—

📧 MX Records1 records 62ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	3600s	guehring-dk.mail.protection.outlook.com	2a01:111:f403:ca04::b 2a01:111:f403:ca04::e 2a01:111:f403:ca09::2 2a01:111:f403:ca09::4 52.101.103.143 52.101.73.15 52.101.73.153 52.101.73.26	mail-dbbpr03cu00103.inbound.protection.outlook.com mail-db8pr02cu00106.inbound.protection.outlook.com mail-am0pr83cu00402.inbound.protection.outlook.com mail-am0pr04cu00504.inbound.protection.outlook.com mail-miypr03cu00107.inbound.protection.outlook.com mail-am9pr04cu00107.inbound.protection.outlook.com mail-as8pr05cu00401.inbound.protection.outlook.com mail-as9pr05cu01302.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
🔶 Autoconfig	guehring.dk → 212.97.109.233

🔷 AAAA Records (IPv6)

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records1 records 153ms

Service	Priority	Weight	Port	Target
_sipfederationtls._tcp	0	1	5061	sipfed.online.lync.com

📝 TXT Records2 records 396ms

TXT Record
knowbe4-site-verification=9d0f4df6f13825cf34e369b1b9ed1921
v=spf1 ip4:212.97.109.201 ip4:212.97.96.157 ip4:194.6.208.114 ip4:194.6.209.235 ip4:194.6.209.236 ip6:2a00:f48:1008::208:114:10 ip6:2a00:f48:1008::209:235:10 ip6:2a00:f48:1008::209:236:10 include:spf.protection.outlook.com -all

✉️ SPF

Policy	Record (guehring.dk)
-all (hard fail)	v=spf1 ip4:212.97.109.201 ip4:212.97.96.157 ip4:194.6.208.114 ip4:194.6.209.235 ip4:194.6.209.236 ip6:2a00:f48:1008::208:114:10 ip6:2a00:f48:1008::209:235:10 ip6:2a00:f48:1008::209:236:10 include:spf.protection.outlook.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

🔏 ACME Challenge

Type	Name	Value
CNAME	_acme-challenge.guehring.dk	guehring.dk
TXT	guehring.dk	knowbe4-site-verification=9d0f4df6f13825cf34e369b1b9ed1921

🔗 TLSA / DANE

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

🔐 DNSSEC85ms

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	2025120404
Primary NS (MNAME)	ns.gbc.systems
Responsible (RNAME)	support@gbc.net
Refresh	3600s
Retry	900s
Expire	1209600s
Minimum (neg-cache TTL)	300s

📋 Registration

✗ No registration data — collected automatically when SOA serial changes

📋 WHOIS

⏱️ Lookup Timing

NS

53ms

A

41ms

MX

62ms

AAAA

43ms

TXT

396ms

CAA

54ms

HTTPS

55ms

TLSA

670ms

SOA

0ms

MTA-STS

137ms

DNSSEC

85ms

SRV

153ms

Total

2462ms

🕐 Scan History

Scanned At	Duration	Records	DNSSEC
2026-08-28 11:13:51	2462ms	5 NS 1 A 1 MX	🔓 Insecure	View
2026-06-26 16:35:54	8248ms	5 NS 1 A 1 MX	🔓 Insecure	View
2026-06-21 08:57:51	1477ms	5 NS 1 A 1 MX	🔓 Insecure	View
2026-06-17 10:38:58	1917ms	5 NS 1 A 1 MX	🔓 Insecure	View
2026-06-17 10:38:22	1575ms	5 NS 1 A 1 MX	🔓 Insecure	View