12u.dk

📜 Historical scan 2026-09-23 13:38:55 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

12u.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 11 March 2003 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 159.253.93.241 is hosted by Itm8 A/S (AS42903) in Denmark. Mail is handled by spamfilter.guldfisk.dk. The zone is DNSSEC-signed and validates, 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 29ms

Nameserver	IP addresses	PTR	ASN / 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 Records#

1 records 34ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
159.253.93.241	43200s	—	AS42903	Itm8 A/S	159.253.88.0/21	🇩🇰 Denmark	Frederiksværk

📧 MX Records#

1 records 47ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	43200s	spamfilter.guldfisk.dk	194.255.97.44	—	AS3308 Norlys Telco A/S

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	12u.dk → 159.253.93.241
🔶 Autoconfig	12u.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

🧩 Web & zone#

latest probe, not this scan · checked 2026-10-09 10:57:23

www CNAME	12u.dk (all on 12u.dk) → 159.253.93.241 (AS42903)
www vs bare domain	Same network 12u.dk: 159.253.93.241 (AS42903) www.12u.dk: 159.253.93.241 (AS42903)
Wildcard	Yes: any name under the zone resolves
CDS / CDNSKEY	None 0 CDS, 0 CDNSKEY

🔏 ACME Challenge#

Type	Name	Value
CNAME	_acme-challenge.12u.dk	12u.dk

🔗 TLSA / DANE#

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

🔐 DNSSEC#

104ms

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

🏷️ SOA#

0ms

Field	Value
Serial	2026092101
Primary NS (MNAME)	ns01.one.com
Responsible (RNAME)	hostmaster@one.com
Refresh	14400s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	600s

📋 Registration#

WHOIS fetched 2026-10-07 10:18:10

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2003-03-11
Expires	2027-03-31 (165d)

📋 WHOIS#

⏱️ Lookup Timing#

29ms

34ms

47ms

AAAA

34ms

TXT

556ms

CAA

199ms

HTTPS

27ms

TLSA

67ms

SOA

0ms

MTA-STS

44ms

DNSSEC

104ms

SRV

435ms

Total

1099ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-09 10:57:23	1091ms	2 NS 1 A 1 MX	🔒 Secure
2026-09-27 00:43:08	658ms	2 NS 1 A 1 MX	🔒 Secure
2026-09-25 14:16:29	736ms	2 NS 1 A 1 MX	🔒 Secure
2026-09-23 13:38:55 shown	1099ms	2 NS 1 A 1 MX	🔒 Secure
2026-09-04 09:42:06	849ms	2 NS 1 A 1 MX	🔒 Secure
2026-08-26 17:55:59	650ms	2 NS 1 A 1 MX	🔒 Secure
2026-07-25 05:27:52	2692ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-30 14:41:34	665ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-16 13:12:43	6764ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-16 13:12:41	686ms	2 NS 1 A 1 MX	🔒 Secure