u3.dk

📜 Historical scan 2026-07-08 13:59:59 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

u3.dk is a .dk domain served by 2 nameservers (katelyn.ns.cloudflare.com, yadiel.ns.cloudflare.com). It was registered on 8 August 2023 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 86.52.56.230 is hosted by Sinal A/S (AS39642) in Denmark. Mail is handled by ispc3.bjasoe.net. The zone is of unknown DNSSEC status, publishes a 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 41ms

Nameserver	IP addresses	PTR	ASN / ISP
katelyn.ns.cloudflare.com	108.162.194.235 162.159.38.235 172.64.34.235 2606:4700:50::a29f:26eb 2803:f800:50::6ca2:c2eb 2a06:98c1:50::ac40:22eb	katelyn.ns.cloudflare.com katelyn.ns.cloudflare.com katelyn.ns.cloudflare.com katelyn.ns.cloudflare.com katelyn.ns.cloudflare.com katelyn.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
yadiel.ns.cloudflare.com	108.162.195.4 162.159.44.4 172.64.35.4 2606:4700:58::a29f:2c04 2803:f800:50::6ca2:c304 2a06:98c1:50::ac40:2304	yadiel.ns.cloudflare.com yadiel.ns.cloudflare.com yadiel.ns.cloudflare.com yadiel.ns.cloudflare.com yadiel.ns.cloudflare.com yadiel.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.

🌍 A Records#

1 records 51ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
86.52.56.230	300s	86-52-56-230.norlyscustomer.net	AS39642	Sinal A/S	86.52.0.0/16	🇩🇰 Denmark	Silkeborg

📧 MX Records#

1 records 49ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	300s	ispc3.bjasoe.net	86.52.56.230	86-52-56-230.norlyscustomer.net	AS39642 Sinal A/S

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	104.21.32.134
🔶 Autoconfig	188.114.97.1

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

1 records 265ms

TXT Record
v=spf1 ip4:86.52.56.230 ip4:46.23.90.161 ip6:2a03:6000:6f63:622::161 -all

✉️ SPF#

Policy	Record (u3.dk)
-all (hard fail)	v=spf1 ip4:86.52.56.230 ip4:46.23.90.161 ip6:2a03:6000:6f63:622::161 -all

📨 DMARC#

Policy	Record (_dmarc.u3.dk)
p=reject	v=DMARC1; p=reject; rua=mailto:c26cfb67b61a4335aa4cb7dd54cac5cb@dmarc-reports.cloudflare.net,mailto:dmarc-report@u3.dk

📬 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 2026-10-12 00:51:21

www	104.21.32.134 172.67.152.74 2606:4700:3030::ac43:984a 2606:4700:3034::6815:2086 (AS13335) (address records, no CNAME)
www vs bare domain	Different networks u3.dk: 86.52.56.230 (AS39642) www.u3.dk: 104.21.32.134 172.67.152.74 2606:4700:3030::ac43:984a 2606:4700:3034::6815:2086 (AS13335) (all like this)
Wildcard	Yes: any name under the zone resolves

✍️ DKIM keys#

1 found

Selector	CNAME	Key
default	—	RSA · ~2048 bit

DKIM selectors can't be listed, so we check the common ones (Microsoft 365, Google, Mailchimp, SendGrid, generic). Keys under other selectors aren't shown.

🔎 SPF check#

zone-wide SPF report

DNS lookups: 0/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

130ms

Check	Result
Validation Status	❓ Unknown
AD Flag (resolver validates)	✗ Not set
DS Record	✗ Not found
DNSKEY Record	✗ Not found
Flags	broken trust chain resolving 'u3.dk/A/IN': 127.0.0.1#53

🏷️ SOA#

0ms

Field	Value
Serial	2408957685
Primary NS (MNAME)	katelyn.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-06 14:51:26

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2023-08-08
Expires	2027-08-07 (294d)

📋 WHOIS#

⏱️ Lookup Timing#

41ms

51ms

49ms

AAAA

47ms

TXT

265ms

CAA

49ms

HTTPS

54ms

TLSA

83ms

SOA

0ms

MTA-STS

48ms

DNSSEC

130ms

SRV

86ms

Total

902ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-06 14:42:42	3399ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-25 12:05:10	650ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-07 03:26:02	817ms	2 NS 1 A 1 MX	🔓 Insecure
2026-08-09 20:01:39	1190ms	2 NS 1 A 1 MX	🔓 Insecure
2026-07-08 13:59:59 shown	902ms	2 NS 1 A 1 MX	❓ Unknown
2026-07-02 11:55:37	1698ms	2 NS 1 A 1 MX	🔓 Insecure
2026-06-26 02:59:30	2042ms	2 NS 1 A 1 MX	🔓 Insecure
2026-06-18 05:14:44	732ms	2 NS 1 A 1 MX	🔓 Insecure