understrup.dk

📜 Historical scan 2026-06-17 21:59:42 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

understrup.dk is a .dk domain served by 2 nameservers (ns1.onwelcom.dk, ns2.onwelcom.dk). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.51.79.130 is hosted by Powernet Aps (AS205984) in Denmark. Mail is handled by mailfilter.onwelcom.dk, mx2.onwelcom.dk. The zone is not DNSSEC-signed, has no DMARC policy and has no IPv6 address. Below are all of its DNS records from this scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.

🖥️ Nameservers#

2 records 43ms

Nameserver	IP addresses	PTR	ASN / ISP
ns1.onwelcom.dk	185.51.79.241	mail.onwelcom.dk	AS205984 Powernet Aps
ns2.onwelcom.dk	185.51.79.251	—	AS205984 Powernet Aps

🌍 A Records#

1 records 36ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
185.51.79.130	—	web02.onwelcom.dk	AS205984	Powernet Aps	185.51.78.0/23	🇩🇰 Denmark	—

📧 MX Records#

2 records 78ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	—	mailfilter.onwelcom.dk	185.51.79.248	mailfilter.powernet.dk	AS205984 Powernet Aps
20	—	mx2.onwelcom.dk	185.51.79.248	mailfilter.powernet.dk	AS205984 Powernet Aps

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	127.0.0.1
🔶 Autoconfig	185.51.79.130

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records#

1 records 106ms

Service	Priority	Weight	Port	Target
_autodiscover._tcp	0	0	443	exchange.onwelcom.dk

📝 TXT Records#

1 records 144ms

TXT Record
v=spf1 a ip4:185.51.79.235 ip4:185.51.79.242 mx ~all

✉️ SPF#

Policy	Record (understrup.dk)
~all (soft fail)	v=spf1 a ip4:185.51.79.235 ip4:185.51.79.242 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

🧩 Web & zone#

latest probe, not this scan · checked 2026-10-11 03:45:42

www	185.51.79.130 (AS205984) (address records, no CNAME)
www vs bare domain	Same network understrup.dk: 185.51.79.130 (AS205984) www.understrup.dk: 185.51.79.130 (AS205984)
Wildcard	Yes: any name under the zone resolves

🔎 SPF check#

zone-wide SPF report

DNS lookups: 2/10 · policy: ~all

No problems found

🔗 TLSA / DANE#

✗ No TLSA records — DANE not configured for HTTPS (_443) or MX (_25)

🔐 DNSSEC#

100ms

Check	Result
Validation Status	🔓 Insecure
AD Flag (resolver validates)	✗ Not set
DS Record	✗ Not found
DNSKEY Record	✗ Not found
Flags	unsigned answer

🏷️ SOA#

50ms

Field	Value
Serial	2017021401
Primary NS (MNAME)	ns1.onwelcom.dk
Responsible (RNAME)	hostmaster@understrup.dk
Refresh	3600s
Retry	600s
Expire	1209600s
Minimum (neg-cache TTL)	86400s

📋 Registration#

✗ No registration data yet — queued for a WHOIS lookup

📋 WHOIS#

⏱️ Lookup Timing#

43ms

36ms

78ms

AAAA

76ms

TXT

144ms

CAA

75ms

HTTPS

107ms

TLSA

51ms

SOA

50ms

MTA-STS

78ms

DNSSEC

100ms

SRV

106ms

Total

478ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-09-30 15:25:43	1160ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-28 21:10:21	3069ms	2 NS 1 A 1 MX	🔓 Insecure
2026-08-28 04:28:52	850ms	2 NS 1 A 2 MX	🔓 Insecure
2026-06-30 14:18:55	2741ms	2 NS 1 A 2 MX	🔓 Insecure
2026-06-25 05:09:01	592ms	2 NS 1 A 2 MX	🔓 Insecure
2026-06-23 12:03:19	567ms	2 NS 1 A 2 MX	🔓 Insecure
2026-06-17 21:59:42 shown	478ms	2 NS 1 A 2 MX	🔓 Insecure