firstclassonline.dk
Last scanned: 2026-08-27 17:44:52  ·  821ms total
⬇ Zone File 📜 Record History ⚡ Scan Now
🖥️ Nameservers2 records   45ms
NameserverIP addressesPTRASN / ISP
ns1.thx.dk 5.57.55.188 mail.thx.dk AS198608 Symbion A/S
ns2.thx.dk 5.57.55.189 — AS198608 Symbion A/S
🌍 A Records
🌍
No A records found
📧 MX Records1 records   94ms
PriorityTTLMail ServerIP addressesPTRASN
10 3600s mail.thx.dk 5.57.55.188 mail.thx.dk AS198608 Symbion A/S
🔷 AAAA Records (IPv6)
✗ No AAAA records — IPv6 not configured
🔐 HTTPS Records
✗ No HTTPS RR — no SVCB/HTTPS service binding
📝 TXT Records1 records   279ms
TXT Record
v=spf1 mx:firstclassonline.dk -all
✉️ SPF
PolicyRecord (firstclassonline.dk)
-all (hard fail) v=spf1 mx:firstclassonline.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
🔗 TLSA / DANE
✗ No TLSA records — DANE not configured for HTTPS (_443) or MX (_25)
🔐 DNSSEC190ms
CheckResult
Validation Status🔓 Insecure
AD Flag (resolver validates)✗ Not set
DS Record✗ Not found
DNSKEY Record✗ Not found
Flagsresolution failed: ncache nxrrset
🏷️ SOA0ms
FieldValue
Serial9
Primary NS (MNAME)ns1.thx.dk
Responsible (RNAME)michaelf@mentalnote.dk
Refresh900s
Retry600s
Expire86400s
Minimum (neg-cache TTL)3600s
📋 Registration
✗ No registration data — collected automatically when SOA serial changes
📋 WHOIS
⏱️ Lookup Timing
NS
45ms
A
41ms
MX
94ms
AAAA
42ms
TXT
279ms
CAA
59ms
HTTPS
44ms
TLSA
93ms
SOA
0ms
MTA-STS
110ms
DNSSEC
190ms
SRV
95ms
Total
821ms
🕐 Scan History
Scanned AtDurationRecordsDNSSEC
2026-08-27 17:44:52 821ms 2 NS 0 A 1 MX 🔓 Insecure View
2026-08-25 00:18:24 6172ms 2 NS 0 A 1 MX 🔓 Insecure View
2026-06-20 22:34:43 441ms 2 NS 0 A 1 MX 🔓 Insecure View
2026-06-20 14:28:11 4859ms 2 NS 0 A 1 MX 🔓 Insecure View
2026-06-17 10:12:56 732ms 2 NS 0 A 1 MX 🔓 Insecure View
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