3f-a.dk

Records from scan: 2026-10-17 21:21:30 · 472ms total

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

3f-a.dk is a .dk domain served by 2 nameservers (jay.ns.cloudflare.com, uma.ns.cloudflare.com). It was registered on 2 July 2004 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.40.228 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 our latest scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.

🖥️ Nameservers#

2 records 26ms

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 31ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.40.228	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.157.144	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

📧

No MX records found

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	3f-a.dk → 217.116.234.104
🔶 Autoconfig	3f-a.dk → 217.116.234.104

🔷 AAAA Records (IPv6)#

2 records 35ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3030::6815:28e4	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3032::ac43:9d90	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 45ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.40.228,172.67.157.144 ech=AEX+DQBBOwAgACARFe9nK5vV9CjGgiItGDjteo3gyUT78fIxKEQjrGu9WAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::6815:28e4,2606:4700:3032::ac43:9d90

📝 TXT Records#

1 records 183ms

TXT Record
v=spf1 -all

✉️ SPF#

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

📨 DMARC#

Policy	Record (_dmarc.3f-a.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#

checked 2026-10-17 21:21:30

www	104.21.40.228 172.67.157.144 2606:4700:3030::6815:28e4 2606:4700:3032::ac43:9d90 (AS13335) (address records, no CNAME)
www vs bare domain	Same network 3f-a.dk: 104.21.40.228 172.67.157.144 2606:4700:3030::6815:28e4 2606:4700:3032::ac43:9d90 (AS13335) www.3f-a.dk: 104.21.40.228 172.67.157.144 2606:4700:3030::6815:28e4 2606:4700:3032::ac43:9d90 (AS13335)
Wildcard	Yes: any name under the zone resolves

🔎 SPF check#

zone-wide SPF report

DNS lookups: 0/10 · policy: -all

No problems found

🔏 ACME Challenge#

Type	Name	Value
TXT	_acme-challenge.3f-a.dk	Fyuq-7hA2GUqg6SNlnu6IwVp3Oza_NZuZi_1f_iYIcY
TXT	_acme-challenge.3f-a.dk	K7j8eClzrlIEJPP4WPtPCPPBPkvWw-gyuydf4V4FSHM

🔗 TLSA / DANE#

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

🔐 DNSSEC#

83ms

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	2417731181
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 2026-10-17 21:32:54

Field	Value
Registrar	Simply.com A/S
Registered	2004-07-02
Expires	2027-07-31 (285d)

🔗 Same registrant#

28 domains

Other .dk domains whose WHOIS registrant has the same name and postal address. Matched on a keyed hash: the registrant's details are not stored or shown. Covers only domains whose WHOIS we have fetched (refreshed about monthly).

Domain	Registrar
3-f.dk	Simply.com A/S
3f.dk	Simply.com A/S
3fa.dk	Simply.com A/S
3fi.dk	Simply.com A/S
3findustri.dk	Simply.com A/S
3finternational.dk	Simply.com A/S
3frus.dk	Simply.com A/S
3ftransport.dk	CURANET A/S
3ftst.dk	Simply.com A/S
3fudvtst.dk	Simply.com A/S
70300300.dk	Simply.com A/S
dagbladet3f.dk	Simply.com A/S
danskemodel.dk	Simply.com A/S
faellesforbundet.dk	Simply.com A/S
fagforeningstjek.dk	Simply.com A/S
fagligtfaellesforbund.dk	Simply.com A/S
fff.dk	Simply.com A/S
fællesskab.dk	Simply.com A/S
landsklubber.dk	Simply.com A/S
langsoehus.dk	Simply.com A/S
lærlinge.dk	Simply.com A/S
ok-rent.dk	Simply.com A/S
overenskomster.dk	Simply.com A/S
r-u-s.dk	Simply.com A/S
tib.dk	Simply.com A/S
trefu.dk	Simply.com A/S
ungi3f.dk	Simply.com A/S
vaerdigreform.dk	Simply.com A/S

📋 WHOIS#

⏱️ Lookup Timing#

26ms

31ms

30ms

AAAA

35ms

TXT

183ms

CAA

35ms

HTTPS

45ms

TLSA

53ms

SOA

50ms

MTA-STS

62ms

DNSSEC

83ms

SRV

78ms

Total

472ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-17 21:21:30 shown	472ms	2 NS 2 A 0 MX	🔓 Insecure
2026-09-30 02:29:23	512ms	2 NS 2 A 0 MX	🔓 Insecure
2026-09-27 17:39:47	618ms	2 NS 2 A 0 MX	🔓 Insecure
2026-08-26 02:51:58	673ms	2 NS 2 A 0 MX	🔓 Insecure
2026-08-19 02:11:38	6116ms	2 NS 2 A 0 MX	🔓 Insecure
2026-08-01 15:23:17	919ms	2 NS 2 A 0 MX	🔓 Insecure
2026-06-30 21:51:17	784ms	2 NS 2 A 0 MX	🔓 Insecure
2026-06-20 06:37:20	2361ms	2 NS 2 A 0 MX	🔓 Insecure
2026-06-16 12:43:50	550ms	2 NS 2 A 0 MX	🔓 Insecure