f5.dk

📜 Historical scan 2026-08-29 00:04:14 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

f5.dk is a .dk domain served by 2 nameservers (lady.ns.cloudflare.com, yahir.ns.cloudflare.com). It was registered on 29 August 2003 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.11.187 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by f5-dk.mail.protection.outlook.com, smtp.google.com. 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 97ms

Nameserver	IP addresses	PTR	ASN / ISP
lady.ns.cloudflare.com	108.162.192.127 172.64.32.127 173.245.58.127 2606:4700:50::adf5:3a7f 2803:f800:50::6ca2:c07f 2a06:98c1:50::ac40:207f	lady.ns.cloudflare.com lady.ns.cloudflare.com lady.ns.cloudflare.com lady.ns.cloudflare.com lady.ns.cloudflare.com lady.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
yahir.ns.cloudflare.com	108.162.195.34 162.159.44.34 172.64.35.34 2606:4700:58::a29f:2c22 2803:f800:50::6ca2:c322 2a06:98c1:50::ac40:2322	yahir.ns.cloudflare.com yahir.ns.cloudflare.com yahir.ns.cloudflare.com yahir.ns.cloudflare.com yahir.ns.cloudflare.com yahir.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 99ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.11.187	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.150.7	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

2 records 103ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	300s	f5-dk.mail.protection.outlook.com	2a01:111:f403:ca04::4 2a01:111:f403:ca04::c 2a01:111:f403:ca09::26 2a01:111:f403:ca38::8 52.101.68.29 52.101.73.153 52.101.73.16 52.101.73.4	mail-db4pr02cu00204.inbound.protection.outlook.com mail-db9pr02cu00204.inbound.protection.outlook.com mail-am8pr83cu00106.inbound.protection.outlook.com mail-wa4pr04cu00100.inbound.protection.outlook.com mail-dbapr03cu00105.inbound.protection.outlook.com mail-as8pr05cu00401.inbound.protection.outlook.com mail-as2pr05cu00100.inbound.protection.outlook.com mail-am0pr83cu00404.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
5	300s	smtp.google.com	142.251.127.26 142.251.127.27 2a00:1450:4001:c21::1a 2a00:1450:4001:c21::1b	lcfrai-in-f26.1e100.net lcfrai-in-f27.1e100.net lcfrai-in-f26.1e100.net lcfrai-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	autodiscover.outlook.com → 40.104.116.40

🔷 AAAA Records (IPv6)#

2 records 72ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3035::6815:bbb	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3036::ac43:9607	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 95ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.11.187,172.67.150.7 ech=AEX+DQBBYAAgACCyOhU0z+1Vi7jXsJnQVu2sBfgbwypPyirAQoKEZDSaKgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3035::6815:bbb,2606:4700:3036::ac43:9607

🔌 SRV Records#

1 records 201ms

Service	Priority	Weight	Port	Target
_sipfederationtls._tcp	100	1	5061	sipfed.online.lync.com

📝 TXT Records#

8 records 317ms

TXT Record
brevo-code:1ab93d96a5e3661d779d3ae1cb9cdf9b
cisco-ci-domain-verification=520e3e486193f38c6c560bd65c5e7769dd68c01c19dbfa31fd1eae1946f4cd7b
google-site-verification=uigcdFsvCxtzUJX_Mu8yE0gA97Ci7Ju9qQgiw-RT5yg
MS=3ABFA9EF7D2CE3D9AB9BF3917522CB6E4B6E70C9
MS=ms14421548
pardot892261=7a778077f50eec28d59c89396805a4b21af34f3f0e5e2fa057f43275a72514e0
twilio-domain-verification=6834a3565d662b57118fc0c18fa8f88f
v=spf1 include:t418g86ox0u7r4yz.p.tawk.email include:spf.protection.outlook.com include:autopilotmail.com include:spf.eu.signature365.net -all

✉️ SPF#

Policy	Record (f5.dk)
-all (hard fail)	v=spf1 include:t418g86ox0u7r4yz.p.tawk.email include:spf.protection.outlook.com include:autopilotmail.com include:spf.eu.signature365.net -all

📨 DMARC#

Policy	Record (_dmarc.f5.dk)
p=quarantine	v=DMARC1; p=quarantine; rua=mailto:rua+pdibyph0vmz3@dmarcwise.email;

📬 MTA-STS#

✗ No MTA-STS policy — SMTP TLS not enforced

📈 TLSRPT#

Status	Report address (rua)
✓ Enabled	mailto:rua+pdibyph0vmz3@dmarcwise.email

📜 CAA Records#

10 records 129ms

Flags	Tag	Value
0	issue	comodoca.com
0	issue	digicert.com; cansignhttpexchanges=yes
0	issue	letsencrypt.org
0	issue	pki.goog; cansignhttpexchanges=yes
0	issue	ssl.com
0	issuewild	comodoca.com
0	issuewild	digicert.com; cansignhttpexchanges=yes
0	issuewild	letsencrypt.org
0	issuewild	pki.goog; cansignhttpexchanges=yes
0	issuewild	ssl.com

🧩 Web & zone#

latest probe, not this scan · checked 2026-10-16 06:01:11

www	104.21.11.187 172.67.150.7 2606:4700:3035::6815:bbb 2606:4700:3036::ac43:9607 (AS13335) (address records, no CNAME)
www vs bare domain	Same network f5.dk: 104.21.11.187 172.67.150.7 2606:4700:3035::6815:bbb 2606:4700:3036::ac43:9607 (AS13335) www.f5.dk: 104.21.11.187 172.67.150.7 2606:4700:3035::6815:bbb 2606:4700:3036::ac43:9607 (AS13335)
Wildcard	No

✍️ DKIM keys#

6 found

Selector	CNAME	Key
google	—	RSA · ~1024 bit below 2048 bit
k1	dkim.mcsv.net	RSA · ~1024 bit below 2048 bit
mail	—	RSA · ~1024 bit below 2048 bit
s1	s1.domainkey.u24695452.wl203.sendgrid.net	RSA · ~2048 bit
s2	s2.domainkey.u24695452.wl203.sendgrid.net	RSA · ~2048 bit
selector1	selector1-f5-dk._domainkey.f5dk365.onmicrosoft.com	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.f5.dk	mk5-81OiyQuLNeRycWs2cekMFIuv9dGnoxPHNIo2ztw

🔗 TLSA / DANE#

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

🔐 DNSSEC#

212ms

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

🏷️ SOA#

0ms

Field	Value
Serial	2413433052
Primary NS (MNAME)	lady.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-07-03 11:42:12

Field	Value
Registrar	CURANET A/S
Registered	2003-08-29
Expires	2032-08-31 (2145d)

📋 WHOIS#

⏱️ Lookup Timing#

97ms

99ms

103ms

AAAA

72ms

TXT

317ms

CAA

129ms

HTTPS

95ms

TLSA

863ms

SOA

0ms

MTA-STS

114ms

DNSSEC

212ms

SRV

201ms

Total

2434ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-09-30 10:21:49	1132ms	2 NS 2 A 2 MX	🔓 Insecure
2026-09-30 09:27:16	969ms	2 NS 2 A 2 MX	🔓 Insecure
2026-09-28 12:06:57	3240ms	2 NS 2 A 2 MX	🔓 Insecure
2026-09-27 11:50:56	2369ms	2 NS 2 A 2 MX	🔓 Insecure
2026-09-09 10:23:59	2116ms	2 NS 2 A 2 MX	🔓 Insecure
2026-08-30 04:37:58	3977ms	2 NS 2 A 2 MX	🔓 Insecure
2026-08-29 00:04:14 shown	2434ms	2 NS 2 A 2 MX	🔓 Insecure
2026-08-08 16:50:21	11314ms	2 NS 2 A 2 MX	🔓 Insecure
2026-07-29 12:12:36	4450ms	2 NS 2 A 2 MX	🔓 Insecure
2026-07-25 04:07:06	17875ms	2 NS 2 A 2 MX	🔓 Insecure
2026-07-11 23:29:16	2275ms	2 NS 2 A 2 MX	🔓 Insecure
2026-07-06 07:40:05	2861ms	2 NS 2 A 2 MX	🔓 Insecure
2026-07-03 11:41:40	2043ms	2 NS 2 A 2 MX	🔓 Insecure
2026-06-27 10:32:23	1688ms	2 NS 2 A 2 MX	🔓 Insecure
2026-06-17 09:10:23	2419ms	2 NS 2 A 2 MX	🔓 Insecure