12u.dk
Last scanned: 2026-08-26 17:55:59  ·  650ms total
⬇ Zone File 📜 Record History ⚡ Scan Now
🖥️ Nameservers2 records   26ms
NameserverIP addressesPTRASN / ISP
ns01.one.com 195.206.121.10
2001:67c:28cc::10		 ns01.one.com
ns01.one.com		 AS197495 One.com A/S
AS197495 One.com A/S
ns02.one.com 185.10.11.10
2001:67c:3c0::10		 ns02.one.com
ns02.one.com		 AS51468 One.com A/S
AS51468 One.com A/S
🌍 A Records1 records   25ms
IPTTLPTRASNISP / OrgCIDRCountryCity
159.253.93.241 43200s — AS42903 Itm8 A/S 159.253.88.0/21 🇩🇰 Denmark Frederiksværk
📧 MX Records1 records   29ms
PriorityTTLMail ServerIP addressesPTRASN
10 43200s spamfilter.guldfisk.dk 194.255.97.44 — AS3308 Norlys Digital A/S
📧 Autodiscover / Autoconfig
ServiceCNAME / IP
🔷 Autodiscover12u.dk → 159.253.93.241
🔶 Autoconfig12u.dk → 159.253.93.241
🔷 AAAA Records (IPv6)
✗ No AAAA records — IPv6 not configured
🔐 HTTPS Records
✗ No HTTPS RR — no SVCB/HTTPS service binding
📝 TXT Records
📝
No TXT records found
✉️ SPF
✗ No SPF record — mail spoofing not restricted
📨 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
TypeNameValue
CNAME _acme-challenge.12u.dk 12u.dk
🔗 TLSA / DANE
✗ No TLSA records — DANE not configured for HTTPS (_443) or MX (_25)
🔐 DNSSEC97ms
CheckResult
Validation Status🔒 Secure
AD Flag (resolver validates)✓ Set
DS Record✓ Found
DNSKEY Record✓ Found
Flagsfully validated
🏷️ SOA0ms
FieldValue
Serial2026082401
Primary NS (MNAME)ns01.one.com
Responsible (RNAME)hostmaster@one.com
Refresh14400s
Retry3600s
Expire1209600s
Minimum (neg-cache TTL)600s
📋 Registration
✗ No registration data — collected automatically when SOA serial changes
📋 WHOIS
⏱️ Lookup Timing
NS
26ms
A
25ms
MX
29ms
AAAA
29ms
TXT
125ms
CAA
22ms
HTTPS
30ms
TLSA
159ms
SOA
0ms
MTA-STS
37ms
DNSSEC
97ms
SRV
45ms
Total
650ms
🕐 Scan History
Scanned AtDurationRecordsDNSSEC
2026-08-26 17:55:59 650ms 2 NS 1 A 1 MX 🔒 Secure View
2026-07-25 05:27:52 2692ms 2 NS 1 A 1 MX 🔒 Secure View
2026-06-30 14:41:34 665ms 2 NS 1 A 1 MX 🔒 Secure View
2026-06-16 13:12:43 6764ms 2 NS 1 A 1 MX 🔒 Secure View
2026-06-16 13:12:41 686ms 2 NS 1 A 1 MX 🔒 Secure View
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