3u.dk

Records from scan: 2026-06-20 22:54:25 · 873ms total · last checked 2026-10-15 17:43 (unchanged)

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

3u.dk is a .dk domain served by 3 nameservers (ns.inwx.de, ns2.inwx.de, ns3.inwx.eu). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 144.76.174.91 is hosted by Hetzner Online GmbH (AS24940) in Germany. Mail is handled by mail.schmitz.pro. The zone is DNSSEC-signed and validates, publishes a DMARC policy and is reachable over IPv6. Below are all of its DNS records from our latest scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.

🖥️ Nameservers#

3 records 125ms

Nameserver	IP addresses	PTR	ASN / ISP
ns.inwx.de	192.174.68.104 2001:67c:1bc::104	ns.domrobot.com ns.inwx.es	AS1921 ipcom GmbH AS1921 ipcom GmbH
ns2.inwx.de	176.97.158.104 2001:67c:10b8::104	ns2.anycastdns.ch ns2.inwx.de	AS207021 ipcom GmbH AS1921 ipcom GmbH
ns3.inwx.eu	2a02:d500::53 45.87.158.53	c.xnameserver.de ns3.inwx.eu	AS48596 InterNetworX Management GmbH AS48596 InterNetworX Management GmbH

🌍 A Records#

1 records 76ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
144.76.174.91	600s	mail.schmitz.pro	AS24940	Hetzner Online GmbH	144.76.0.0/16	🇩🇪 Germany	Falkenstein

📧 MX Records#

1 records 114ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	600s	mail.schmitz.pro	144.76.174.91 2a01:4f8:200:5262::2	mail.schmitz.pro mail.schmitz.pro	AS24940 Hetzner Online GmbH AS24940 Hetzner Online GmbH

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	144.76.174.91
🔶 Autoconfig	144.76.174.91

🔷 AAAA Records (IPv6)#

1 records 123ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2a01:4f8:200:5262::2	600s	mail.schmitz.pro	AS24940	Hetzner Online GmbH	2a01:4f8:0:0:0:0:0:0/31	🇩🇪 Germany	Falkenstein

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

1 records 281ms

TXT Record
v=spf1 a mx ip4:144.76.174.91 ip6:2a01:4f8:200:5262::2 -all

✉️ SPF#

Policy	Record (3u.dk)
-all (hard fail)	v=spf1 a mx ip4:144.76.174.91 ip6:2a01:4f8:200:5262::2 -all

📨 DMARC#

Policy	Record (_dmarc.3u.dk)
p=none (monitor only)	v=DMARC1; p=none

📬 MTA-STS#

✗ No MTA-STS policy — SMTP TLS not enforced

📈 TLSRPT#

✗ No TLSRPT record — no SMTP TLS failure reporting

📜 CAA Records#

1 records 65ms

Flags	Tag	Value
128	issue	letsencrypt.org

🧩 Web & zone#

checked 2026-10-11 06:38:30

www	144.76.174.91 2a01:4f8:200:5262::2 (AS24940) (address records, no CNAME)
www vs bare domain	Same network 3u.dk: 144.76.174.91 2a01:4f8:200:5262::2 (AS24940) www.3u.dk: 144.76.174.91 2a01:4f8:200:5262::2 (AS24940)
Wildcard	Yes: any name under the zone resolves
Denial of existence	NSEC3 · 1 iteration · 1-byte salt RFC 9276 recommends 0 iterations and no salt
CDS / CDNSKEY	Published: key rollovers can be automated with the registry (RFC 7344/8078) 2 CDS, 1 CDNSKEY

✍️ DKIM keys#

1 found

Selector	CNAME	Key
mail	—	RSA · ~1024 bit below 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: 2/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

119ms

Check	Result
Validation Status	🔒 Secure
AD Flag (resolver validates)	✓ Set
DS Record	✓ Found
DNSKEY Record	✓ Found
Flags	fully validated

🏷️ SOA#

118ms

Field	Value
Serial	2025071304
Primary NS (MNAME)	ns.inwx.de
Responsible (RNAME)	hostmaster@inwx.de
Refresh	10800s
Retry	3600s
Expire	604800s
Minimum (neg-cache TTL)	3600s

📋 Registration#

✗ No registration data yet — queued for a WHOIS lookup

📋 WHOIS#

⏱️ Lookup Timing#

125ms

76ms

114ms

AAAA

123ms

TXT

281ms

CAA

65ms

HTTPS

116ms

TLSA

338ms

SOA

118ms

MTA-STS

76ms

DNSSEC

119ms

SRV

156ms

Total

873ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-06-20 22:54:25 shown	873ms	3 NS 1 A 1 MX	🔒 Secure
2026-06-16 13:14:11	911ms	3 NS 1 A 1 MX	🔒 Secure