undertow.dk
Last scanned: 2026-07-28 00:54:33  ·  6730ms total
⬇ Zone File 📜 Record History ⚡ Scan Now
🖥️ Nameservers2 records   32ms
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   31ms
IPTTLPTRASNISP / OrgCIDRCountryCity
87.104.83.156 3600s mx.upnavigator.dk AS204274 AURA Fiber A/S 87.104.64.0/18 🇩🇰 Denmark Odder
📧 MX Records1 records   32ms
PriorityTTLMail ServerIP addressesPTRASN
10 3600s mx.upnavigator.dk 87.104.83.156 mx.upnavigator.dk AS204274 AURA Fiber A/S
📧 Autodiscover / Autoconfig
ServiceCNAME / IP
🔷 Autodiscoverundertow.dk → 87.104.83.156
🔶 Autoconfigundertow.dk → 87.104.83.156
🔷 AAAA Records (IPv6)
✗ No AAAA records — IPv6 not configured
🔐 HTTPS Records
✗ No HTTPS RR — no SVCB/HTTPS service binding
📝 TXT Records1 records   155ms
TXT Record
v=spf1 a mx a:mx.upnavigator.dk ip4:87.104.83.156 ~all
✉️ SPF
PolicyRecord (undertow.dk)
~all (soft fail) v=spf1 a mx a:mx.upnavigator.dk ip4:87.104.83.156 ~all
📨 DMARC
PolicyRecord (_dmarc.undertow.dk)
p=quarantine v=DMARC1;p=quarantine;sp=quarantine;pct=100;rua=mailto:info@upnavigator.dk;ruf=mailto:info@upnavigator.dk;rf=afrf;ri=86400;fo=1
📬 MTA-STS
✗ No MTA-STS policy — SMTP TLS not enforced
📈 TLSRPT
✗ No TLSRPT record — no SMTP TLS failure reporting
📜 CAA Records1 records   30ms
FlagsTagValue
0 issue letsencrypt.org
🔏 ACME Challenge
TypeNameValue
CNAME _acme-challenge.undertow.dk undertow.dk
🔗 TLSA / DANE
✗ No TLSA records — DANE not configured for HTTPS (_443) or MX (_25)
🔐 DNSSEC53ms
CheckResult
Validation Status🔒 Secure
AD Flag (resolver validates)✓ Set
DS Record✓ Found
DNSKEY Record✓ Found
Flagsfully validated
🏷️ SOA24ms
FieldValue
Serial2026032401
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
32ms
A
31ms
MX
32ms
AAAA
31ms
TXT
155ms
CAA
30ms
HTTPS
30ms
TLSA
2063ms
SOA
24ms
MTA-STS
31ms
DNSSEC
53ms
SRV
45ms
Total
6730ms
🕐 Scan History
Scanned AtDurationRecordsDNSSEC
2026-07-28 00:54:33 6730ms 2 NS 1 A 1 MX 🔒 Secure View
2026-06-25 07:31:26 665ms 2 NS 1 A 1 MX 🔒 Secure View
2026-06-17 23:50:09 1282ms 2 NS 1 A 1 MX 🔒 Secure View
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