core4it.dk
Last scanned: 2026-08-31 15:17:09  ·  2593ms total
⬇ Zone File 📜 Record History ⚡ Scan Now
🖥️ Nameservers4 records   58ms
NameserverIP addressesPTRASN / ISP
dns1.p01.nsone.net 198.51.44.1
2620:4d:4000:6259:7:1:0:1		 dns1.p01.nsone.net
dns1.p01.nsone.net		 AS62597 NSONE Inc
AS62597 NSONE Inc
dns2.p01.nsone.net 198.51.45.1
2a00:edc0:6259:7:1::2		 dns2.p01.nsone.net
dns2.p01.nsone.net		 AS62597 NSONE Inc
AS62597 NSONE Inc
dns3.p01.nsone.net 198.51.44.65
2620:4d:4000:6259:7:1:0:3		 dns3.p01.nsone.net
dns3.p01.nsone.net		 AS62597 NSONE Inc
AS62597 NSONE Inc
dns4.p01.nsone.net 198.51.45.65
2a00:edc0:6259:7:1::4		 dns4.p01.nsone.net
dns4.p01.nsone.net		 AS62597 NSONE Inc
AS62597 NSONE Inc
🌍 A Records2 records   87ms
IPTTLPTRASNISP / OrgCIDRCountryCity
35.157.26.135 120s ec2-35-157-26-135.eu-central-1.compute.amazonaws.com AS16509 Amazon.com, Inc. 35.156.0.0/14 🇩🇪 Germany Frankfurt am Main
63.176.8.218 120s ec2-63-176-8-218.eu-central-1.compute.amazonaws.com AS16509 Amazon.com, Inc. 63.176.0.0/12 🇩🇪 Germany Frankfurt am Main
📧 MX Records2 records   63ms
PriorityTTLMail ServerIP addressesPTRASN
10 300s mail.protonmail.ch 176.119.200.128
185.205.70.128
185.70.42.128		 mail.protonmail.ch
mail.protonmail.ch
mail.protonmail.ch		 AS62371 Proton AG
AS62371 Proton AG
AS62371 Proton AG
20 300s mailsec.protonmail.ch 176.119.200.129
185.205.70.129
185.70.42.129		 mailsec.protonmail.ch
mailsec.protonmail.ch
mailsec.protonmail.ch		 AS62371 Proton AG
AS62371 Proton AG
AS62371 Proton AG
🔷 AAAA Records (IPv6)
✗ No AAAA records — IPv6 not configured
🔐 HTTPS Records
✗ No HTTPS RR — no SVCB/HTTPS service binding
📝 TXT Records2 records   296ms
TXT Record
protonmail-verification=5be2cc634ceecd63fc8ded303063c7a0e6137882
v=spf1 include:_spf.protonmail.ch ~all
✉️ SPF
PolicyRecord (core4it.dk)
~all (soft fail) v=spf1 include:_spf.protonmail.ch ~all
📨 DMARC
PolicyRecord (_dmarc.core4it.dk)
p=quarantine v=DMARC1; p=quarantine
📬 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 / DANE4 records   97ms
Service / OwnerTypeCert association
SMTP _25._tcp.mail.protonmail.ch DANE-EE · SPKI · SHA-256 6111A5698D23C89E09C36FF833C1487E…
SMTP _25._tcp.mail.protonmail.ch DANE-EE · SPKI · SHA-256 76BB66711DA416433CA890A5B2E5A053…
SMTP _25._tcp.mailsec.protonmail.ch DANE-EE · SPKI · SHA-256 76BB66711DA416433CA890A5B2E5A053…
SMTP _25._tcp.mailsec.protonmail.ch DANE-EE · SPKI · SHA-256 6111A5698D23C89E09C36FF833C1487E…
🔐 DNSSEC2074ms
CheckResult
Validation Status🔓 Insecure
AD Flag (resolver validates)✗ Not set
DS Record✗ Not found
DNSKEY Record✗ Not found
Flagsunsigned answer
🏷️ SOA0ms
FieldValue
Serial1765711048
Primary NS (MNAME)dns1.p01.nsone.net
Responsible (RNAME)domains+netlify@netlify.com
Refresh43200s
Retry7200s
Expire1209600s
Minimum (neg-cache TTL)3600s
📋 Registration
✗ No registration data — collected automatically when SOA serial changes
📋 WHOIS
⏱️ Lookup Timing
NS
58ms
A
87ms
MX
63ms
AAAA
76ms
TXT
296ms
CAA
54ms
HTTPS
70ms
TLSA
97ms
SOA
0ms
MTA-STS
93ms
DNSSEC
2074ms
SRV
96ms
Total
2593ms
🕐 Scan History
Scanned AtDurationRecordsDNSSEC
2026-08-31 15:17:09 2593ms 4 NS 2 A 2 MX 🔓 Insecure View
2026-08-25 22:40:40 9627ms 4 NS 2 A 2 MX 🔓 Insecure View
2026-07-02 12:16:40 2801ms 4 NS 2 A 2 MX 🔓 Insecure View
2026-06-25 07:32:53 1131ms 4 NS 2 A 2 MX 🔓 Insecure View
2026-06-22 19:17:20 902ms 0 NS 0 A 0 MX ❓ Unknown View
2026-06-16 22:25:18 902ms 4 NS 2 A 2 MX ❓ Unknown View
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