3fu.dk

📜 Historical scan 2026-09-25 23:39:30 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

3fu.dk is a .dk domain served by 2 nameservers (jay.ns.cloudflare.com, uma.ns.cloudflare.com). It was registered on 2 September 2004 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.68.197 is hosted by Cloudflare, Inc. (AS13335). The zone is not DNSSEC-signed, publishes a DMARC policy and is reachable over IPv6. 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 38ms

Nameserver	IP addresses	PTR	ASN / ISP
jay.ns.cloudflare.com	108.162.193.123 172.64.33.123 173.245.59.123 2606:4700:58::adf5:3b7b 2803:f800:50::6ca2:c17b 2a06:98c1:50::ac40:217b	jay.ns.cloudflare.com jay.ns.cloudflare.com jay.ns.cloudflare.com jay.ns.cloudflare.com jay.ns.cloudflare.com jay.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
uma.ns.cloudflare.com	108.162.192.146 172.64.32.146 173.245.58.146 2606:4700:50::adf5:3a92 2803:f800:50::6ca2:c092 2a06:98c1:50::ac40:2092	uma.ns.cloudflare.com uma.ns.cloudflare.com uma.ns.cloudflare.com uma.ns.cloudflare.com uma.ns.cloudflare.com uma.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.

🌍 A Records#

2 records 35ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.68.197	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.198.39	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

📧

No MX records found

🔷 AAAA Records (IPv6)#

2 records 33ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3032::6815:44c5	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3037::ac43:c627	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 41ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.68.197,172.67.198.39 ech=AEX+DQBBZAAgACD7U6Bp3UF9yPEB9CBJVUlN9PH88Ux2OvS0YciffWyPQgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3032::6815:44c5,2606:4700:3037::ac43:c627

📝 TXT Records#

1 records 186ms

TXT Record
v=spf1 -all

✉️ SPF#

Policy	Record (3fu.dk)
-all (hard fail)	v=spf1 -all

📨 DMARC#

Policy	Record (_dmarc.3fu.dk)
p=reject	v=DMARC1; p=reject; sp=reject; adkim=s; aspf=s;

📬 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 2026-10-10 05:28:02

www	104.21.68.197 172.67.198.39 2606:4700:3032::6815:44c5 2606:4700:3037::ac43:c627 (AS13335) (address records, no CNAME)
www vs bare domain	Same network 3fu.dk: 104.21.68.197 172.67.198.39 2606:4700:3032::6815:44c5 2606:4700:3037::ac43:c627 (AS13335) www.3fu.dk: 104.21.68.197 172.67.198.39 2606:4700:3032::6815:44c5 2606:4700:3037::ac43:c627 (AS13335)
Wildcard	No
Denial of existence	Compact NSEC (RFC 9824, "black lies") not walkable
CDS / CDNSKEY	Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY

🔎 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#

116ms

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

🏷️ SOA#

0ms

Field	Value
Serial	2415805850
Primary NS (MNAME)	jay.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-01 00:41:23

Field	Value
Registrar	Simply.com A/S
Registered	2004-09-02
Expires	2027-09-30 (347d)

📋 WHOIS#

⏱️ Lookup Timing#

38ms

35ms

33ms

AAAA

33ms

TXT

186ms

CAA

39ms

HTTPS

41ms

TLSA

60ms

SOA

0ms

MTA-STS

53ms

DNSSEC

116ms

SRV

61ms

Total

614ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-06 01:22:56	1928ms	2 NS 2 A 0 MX	🔓 Insecure
2026-10-01 00:29:06	709ms	2 NS 2 A 0 MX	🔓 Insecure
2026-09-25 23:39:30 shown	614ms	2 NS 2 A 0 MX	🔓 Insecure
2026-09-24 23:17:12	579ms	2 NS 2 A 0 MX	🔓 Insecure
2026-09-23 22:35:11	760ms	2 NS 2 A 0 MX	🔓 Insecure
2026-09-12 12:38:45	1049ms	2 NS 2 A 0 MX	🔓 Insecure
2026-08-18 21:20:21	19799ms	2 NS 2 A 0 MX	🔓 Insecure
2026-08-03 12:55:11	8966ms	2 NS 2 A 0 MX	🔓 Insecure
2026-07-27 12:46:56	8737ms	2 NS 2 A 0 MX	🔓 Insecure
2026-07-26 12:14:49	3314ms	2 NS 2 A 0 MX	🔓 Insecure
2026-07-01 23:13:13	1944ms	2 NS 2 A 0 MX	🔓 Insecure
2026-06-16 12:36:39	563ms	2 NS 2 A 0 MX	🔓 Insecure