3f.dk

📜 Historical scan 2026-06-20 11:26:01 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

3f.dk is a .dk domain served by 2 nameservers (lisa.ns.cloudflare.com, max.ns.cloudflare.com). It was registered on 1 November 2002 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 172.66.40.249 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by 3f-dk.f-v1.mx.microsoft. The zone is DNSSEC-signed and validates, 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 33ms

Nameserver	IP addresses	PTR	ASN / ISP
lisa.ns.cloudflare.com	108.162.192.131 172.64.32.131 173.245.58.131 2606:4700:50::adf5:3a83 2803:f800:50::6ca2:c083 2a06:98c1:50::ac40:2083	lisa.ns.cloudflare.com lisa.ns.cloudflare.com lisa.ns.cloudflare.com lisa.ns.cloudflare.com lisa.ns.cloudflare.com lisa.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
max.ns.cloudflare.com	108.162.193.132 172.64.33.132 173.245.59.132 2606:4700:58::adf5:3b84 2803:f800:50::6ca2:c184 2a06:98c1:50::ac40:2184	max.ns.cloudflare.com max.ns.cloudflare.com max.ns.cloudflare.com max.ns.cloudflare.com max.ns.cloudflare.com max.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 41ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
172.66.40.249	600s	—	AS13335	Cloudflare, Inc.	172.66.40.0/21	—	—
172.66.43.7	600s	—	AS13335	Cloudflare, Inc.	172.66.40.0/21	—	—

📧 MX Records#

1 records 42ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	600s	3f-dk.f-v1.mx.microsoft	2a01:111:f403:ca04::2 2a01:111:f403:ca04::e 2a01:111:f403:ca09::4 2a01:111:f403:ca09::6 52.101.68.32 52.101.73.16 52.101.73.30 52.101.73.6	mail-du2pr03cu00102.inbound.protection.outlook.com mail-db8pr02cu00106.inbound.protection.outlook.com mail-am0pr04cu00504.inbound.protection.outlook.com mail-am4pr0401cu00106.inbound.protection.outlook.com mail-db3pr0202cu00200.inbound.protection.outlook.com mail-as2pr05cu00100.inbound.protection.outlook.com mail-am7pr05cu00306.inbound.protection.outlook.com mail-am6pr04cu00306.inbound.protection.outlook.com	AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	autodiscover.outlook.com → 40.104.116.8

🔷 AAAA Records (IPv6)#

2 records 44ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3108::ac42:28f9	600s	—	AS13335	Cloudflare, Inc.	2606:4700:3108:0:0:0:0:0/48	—	—
2606:4700:3108::ac42:2b07	600s	—	AS13335	Cloudflare, Inc.	2606:4700:3108:0:0:0:0:0/48	—	—

🔐 HTTPS Records#

1 records 58ms

Priority	Target	SvcParams
1 service	.	alpn="h2" ipv4hint=172.66.40.249,172.66.43.7 ipv6hint=2606:4700:3108::ac42:28f9,2606:4700:3108::ac42:2b07

🔌 SRV Records#

1 records 177ms

Service	Priority	Weight	Port	Target
_sipfederationtls._tcp	0	0	5061	sipfed.online.lync.com

📝 TXT Records#

10 records 264ms

TXT Record
_kfi60qo31fwon3pfl52rufqghuku2s4
_nn3od9bbc7n791yym1ek0m8rat2giko
9b57k4tmyw99cxyd647lkst0bb5yl9nt
apple-domain-verification=I7NcqCXHmBPnQvA3
facebook-domain-verification=cx1i1lglcowp198g4bgigvaes4baeo
google-site-verification=H1dyJKnjA-UgTyLq-I0XYAE3oTlg-syy-_vdRs7IbnM
google-site-verification=ZT0IrlPw0Or4SHyagAvP5ye8oJGI4c2PPuDBVrluaAo
mindmanager-verification=79b0e23d95d2d253211befb91a68fa41f6edbf5a8bbe869976831f0fddb0cff4
MS=ms12157205
v=spf1 ip4:52.232.5.115 ip4:77.66.57.123 ip4:168.245.61.203 ip4:168.245.67.108 ip4:193.163.134.0/24 ip4:159.183.35.2 include:spf.protection.outlook.com include:dedicated.mysmtp.com include:spf.mph1.com include:spf.hatteland.com -all

✉️ SPF#

Policy	Record (3f.dk)
-all (hard fail)	v=spf1 ip4:52.232.5.115 ip4:77.66.57.123 ip4:168.245.61.203 ip4:168.245.67.108 ip4:193.163.134.0/24 ip4:159.183.35.2 include:spf.protection.outlook.com include:dedicated.mysmtp.com include:spf.mph1.com include:spf.hatteland.com -all

📨 DMARC#

Policy	Record (_dmarc.3f.dk)
p=reject	v=DMARC1; p=reject; rua=mailto:7lrymkqp@ag.eu.dmarcian.com; ruf=mailto:7lrymkqp@fr.eu.dmarcian.com;

📬 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 10:18:57

www	172.66.40.249 172.66.43.7 2606:4700:3108::ac42:28f9 2606:4700:3108::ac42:2b07 (AS13335) (address records, no CNAME)
www vs bare domain	Same network 3f.dk: 172.66.40.249 172.66.43.7 2606:4700:3108::ac42:28f9 2606:4700:3108::ac42:2b07 (AS13335) www.3f.dk: 172.66.40.249 172.66.43.7 2606:4700:3108::ac42:28f9 2606:4700:3108::ac42:2b07 (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

✍️ DKIM keys#

3 found

Selector	CNAME	Key
default	—	RSA · ~1024 bit below 2048 bit
s1	s1.domainkey.u7959841.wl092.sendgrid.net	RSA · ~2048 bit
s2	s2.domainkey.u7959841.wl092.sendgrid.net	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: 7/10 · policy: -all

No problems found

🔏 ACME Challenge#

Type	Name	Value
TXT	_acme-challenge.3f.dk	JYnCL1geUoFBesYEqIo7mjZ0QCxT09mbIGADR_Pf84E
TXT	_acme-challenge.3f.dk	nyEULq9vQmboqgKlDDpEshs0Aa9T1KKmkBEq-KRjT4g

🔗 TLSA / DANE#

6 records 124ms

Service / Owner	Type	Cert association
SMTP _25._tcp.3f-dk.f-v1.mx.microsoft	DANE-TA · Full cert · SHA-256	5F88694615E4C61686E106B84C3338C6…
SMTP _25._tcp.3f-dk.f-v1.mx.microsoft	DANE-TA · Full cert · SHA-256	6EBFF927297A5B3AAF5EAE672252C36A…
SMTP _25._tcp.3f-dk.f-v1.mx.microsoft	DANE-EE · SPKI · SHA-256	133086C7B822371A4A3304F1661A7880…
SMTP _25._tcp.3f-dk.f-v1.mx.microsoft	DANE-EE · SPKI · SHA-256	A6C267923B26A4A9617EDA73D8DB4FBC…
SMTP _25._tcp.3f-dk.f-v1.mx.microsoft	DANE-EE · SPKI · SHA-256	C495D9E40F7E625BE22F83CC64305182…
SMTP _25._tcp.3f-dk.f-v1.mx.microsoft	DANE-TA · Full cert · SHA-256	38D895F5105BC2545822C17A2444F4B0…

🔐 DNSSEC#

82ms

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

🏷️ SOA#

33ms

Field	Value
Serial	2407358045
Primary NS (MNAME)	lisa.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-11 12:34:34

Field	Value
Registrar	Simply.com A/S
Registered	2002-11-01
Expires	2026-12-31 (75d)

🔗 Same registrant#

17 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
3fa.dk	Simply.com A/S
3fi.dk	Simply.com A/S
3findustri.dk	Simply.com A/S
3ftransport.dk	CURANET A/S
3fudvtst.dk	Simply.com A/S
danskemodel.dk	Simply.com A/S
faellesforbundet.dk	Simply.com A/S
fagforeningstjek.dk	Simply.com A/S
landsklubber.dk	Simply.com A/S
langsoehus.dk	Simply.com A/S
lærlinge.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
vaerdigreform.dk	Simply.com A/S

📋 WHOIS#

⏱️ Lookup Timing#

33ms

41ms

42ms

AAAA

44ms

TXT

264ms

CAA

58ms

HTTPS

58ms

TLSA

124ms

SOA

33ms

MTA-STS

55ms

DNSSEC

82ms

SRV

177ms

Total

827ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-09 10:18:57	1038ms	2 NS 2 A 1 MX	🔒 Secure
2026-10-04 04:05:34	634ms	2 NS 2 A 1 MX	🔒 Secure
2026-10-01 07:36:48	654ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-30 12:21:29	939ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-27 11:49:17	787ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-23 03:50:46	1418ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-03 23:27:29	742ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-29 14:16:11	1384ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-28 05:24:24	1079ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-17 21:11:08	4767ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-12 17:46:35	5117ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-08 03:08:11	1604ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-04 05:33:33	1401ms	2 NS 2 A 1 MX	🔒 Secure
2026-07-21 04:25:15	1409ms	2 NS 2 A 1 MX	🔒 Secure
2026-07-17 20:04:27	2072ms	2 NS 2 A 1 MX	🔒 Secure
2026-07-12 06:57:47	1473ms	2 NS 2 A 1 MX	🔒 Secure
2026-07-07 03:23:16	1546ms	2 NS 2 A 1 MX	🔒 Secure
2026-07-03 06:17:10	1006ms	2 NS 2 A 1 MX	🔒 Secure
2026-06-26 08:28:27	774ms	2 NS 2 A 1 MX	🔒 Secure
2026-06-20 11:26:01 shown	827ms	2 NS 2 A 1 MX	🔒 Secure
2026-06-16 12:47:59	2952ms	2 NS 2 A 1 MX	🔓 Insecure