3u.dk
Last scanned: 2026-06-20 22:54:25  ·  873ms total
⬇ Zone File 📜 Record History ⚡ Scan Now
🖥️ Nameservers3 records   125ms
NameserverIP addressesPTRASN / ISP
ns.inwx.de 192.174.68.104
2001:67c:1bc::104		 ns.domrobot.com
ns.inwx.es		 AS1921 ipcom GmbH
AS1921 ipcom GmbH
ns2.inwx.de 176.97.158.104
2001:67c:10b8::104		 ns2.anycastdns.ch
ns2.inwx.de		 AS207021 ipcom GmbH
AS207021 ipcom GmbH
ns3.inwx.eu 2a02:d500::53
45.87.158.53		 c.xnameserver.de
ns3.inwx.eu		 AS48596 InterNetworX Management GmbH
AS48596 InterNetworX Management GmbH
🌍 A Records1 records   76ms
IPTTLPTRASNISP / OrgCIDRCountryCity
144.76.174.91 600s mail.schmitz.pro AS24940 Hetzner Online GmbH 144.76.0.0/16 🇩🇪 Germany Falkenstein
📧 MX Records1 records   114ms
PriorityTTLMail ServerIP addressesPTRASN
10 600s mail.schmitz.pro 144.76.174.91
2a01:4f8:200:5262::2		 mail.schmitz.pro
mail.schmitz.pro		 AS24940 Hetzner Online GmbH
AS24940 Hetzner Online GmbH
📧 Autodiscover / Autoconfig
ServiceCNAME / IP
🔷 Autodiscover144.76.174.91
🔶 Autoconfig144.76.174.91
🔷 AAAA Records (IPv6)1 records   123ms
IPv6 AddressTTLPTRASNISP / OrgCIDRCountryCity
2a01:4f8:200:5262::2 600s mail.schmitz.pro AS24940 Hetzner Online GmbH 2a01:4f8:0:0:0:0:0:0/31 🇩🇪 Germany Falkenstein
🔐 HTTPS Records
✗ No HTTPS RR — no SVCB/HTTPS service binding
📝 TXT Records1 records   281ms
TXT Record
v=spf1 a mx ip4:144.76.174.91 ip6:2a01:4f8:200:5262::2 -all
✉️ SPF
PolicyRecord (3u.dk)
-all (hard fail) v=spf1 a mx ip4:144.76.174.91 ip6:2a01:4f8:200:5262::2 -all
📨 DMARC
PolicyRecord (_dmarc.3u.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 Records1 records   65ms
FlagsTagValue
128 issue letsencrypt.org
🔗 TLSA / DANE
✗ No TLSA records — DANE not configured for HTTPS (_443) or MX (_25)
🔐 DNSSEC119ms
CheckResult
Validation Status🔒 Secure
AD Flag (resolver validates)✓ Set
DS Record✓ Found
DNSKEY Record✓ Found
Flagsfully validated
🏷️ SOA118ms
FieldValue
Serial2025071304
Primary NS (MNAME)ns.inwx.de
Responsible (RNAME)hostmaster@inwx.de
Refresh10800s
Retry3600s
Expire604800s
Minimum (neg-cache TTL)3600s
📋 Registration
✗ No registration data — collected automatically when SOA serial changes
📋 WHOIS
⏱️ Lookup Timing
NS
125ms
A
76ms
MX
114ms
AAAA
123ms
TXT
281ms
CAA
65ms
HTTPS
116ms
TLSA
338ms
SOA
118ms
MTA-STS
76ms
DNSSEC
119ms
SRV
156ms
Total
873ms
🕐 Scan History
Scanned AtDurationRecordsDNSSEC
2026-06-20 22:54:25 873ms 3 NS 1 A 1 MX 🔒 Secure View
2026-06-16 13:14:11 911ms 3 NS 1 A 1 MX 🔒 Secure View
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