rtcas.dk
Last scanned: 2026-07-02 12:35:11  ·  2516ms total
⬇ Zone File 📜 Record History ⚡ Scan Now
🖥️ Nameservers4 records   62ms
NameserverIP addressesPTRASN / ISP
ns1.c1.sdc-hosting.com 185.152.201.34 ns1.c1.sdc-hosting.com AS202567 Secure Data Center Aps
ns1.c2.sdc-hosting.com 185.152.200.31 ns1.c2.sdc-hosting.com AS202567 Secure Data Center Aps
ns1.c3.sdc-hosting.com 38.77.132.2 ns1.c3.nordic-backup.com AS174 Cogent Communications, LLC
ns1.c4.sdc-hosting.com 38.77.132.3 ns1.c4.nordic-backup.com AS174 Cogent Communications, LLC
🌍 A Records
🌍
No A records found
📧 MX Records3 records   43ms
PriorityTTLMail ServerIP addressesPTRASN
10 86400s mail1.c3.sdc-hosting.com 38.77.132.4 mail1.c3.sdc-hosting.com AS174 Cogent Communications, LLC
20 86400s mail1.c1.sdc-hosting.com 185.152.201.6
185.152.201.6
185.152.201.6		 mail1.c1.sdc-hosting.com
mailrelay1.c1.sdc-hosting.com
mail1.c1.securedatacenter.dk		 AS202567 Secure Data Center Aps
AS202567 Secure Data Center Aps
AS202567 Secure Data Center Aps
20 86400s mail1.c2.sdc-hosting.com 185.152.200.6
185.152.200.6
185.152.200.6		 mailrelay1.c2.sdc-hosting.com
mail1.c2.sdc-hosting.com
mail1.c2.securedatacenter.dk		 AS202567 Secure Data Center Aps
AS202567 Secure Data Center Aps
AS202567 Secure Data Center Aps
🔷 AAAA Records (IPv6)
✗ No AAAA records — IPv6 not configured
🔐 HTTPS Records
✗ No HTTPS RR — no SVCB/HTTPS service binding
📝 TXT Records1 records   417ms
TXT Record
v=spf1 mx -all
✉️ SPF
PolicyRecord (rtcas.dk)
-all (hard fail) v=spf1 mx -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)
🔐 DNSSEC1314ms
CheckResult
Validation Status🔓 Insecure
AD Flag (resolver validates)✗ Not set
DS Record✗ Not found
DNSKEY Record✗ Not found
Flagsresolution failed: ncache nxrrset
🏷️ SOA307ms
FieldValue
Serial59
Primary NS (MNAME)ns1.c1.sdc-hosting.com
Responsible (RNAME)support@sdc-hosting.com
Refresh900s
Retry300s
Expire1209600s
Minimum (neg-cache TTL)86400s
📋 Registration
✗ No registration data — collected automatically when SOA serial changes
📋 WHOIS
⏱️ Lookup Timing
NS
62ms
A
62ms
MX
43ms
AAAA
62ms
TXT
417ms
CAA
160ms
HTTPS
181ms
TLSA
315ms
SOA
307ms
MTA-STS
73ms
DNSSEC
1314ms
SRV
629ms
Total
2516ms
🕐 Scan History
Scanned AtDurationRecordsDNSSEC
2026-07-02 12:35:11 2516ms 4 NS 0 A 3 MX 🔓 Insecure View
2026-06-22 03:25:59 1663ms 4 NS 0 A 0 MX 🔓 Insecure View
2026-06-21 13:26:02 1116ms 0 NS 0 A 0 MX ❓ Unknown View
2026-06-18 02:26:15 1620ms 4 NS 0 A 3 MX 🔓 Insecure View
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