c16k.dk

📜 Historical scan 2026-08-19 05:54:50 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

c16k.dk is a .dk domain served by 2 nameservers (ivan.ns.cloudflare.com, ruth.ns.cloudflare.com). It was registered on 12 January 2024 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.4.170 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mail.c16k.dk. 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 231ms

Nameserver	IP addresses	PTR	ASN / ISP
ivan.ns.cloudflare.com	108.162.193.120 172.64.33.120 173.245.59.120 2606:4700:58::adf5:3b78 2803:f800:50::6ca2:c178 2a06:98c1:50::ac40:2178	ivan.ns.cloudflare.com ivan.ns.cloudflare.com ivan.ns.cloudflare.com ivan.ns.cloudflare.com ivan.ns.cloudflare.com ivan.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
ruth.ns.cloudflare.com	108.162.192.143 172.64.32.143 173.245.58.143 2606:4700:50::adf5:3a8f 2803:f800:50::6ca2:c08f 2a06:98c1:50::ac40:208f	ruth.ns.cloudflare.com ruth.ns.cloudflare.com ruth.ns.cloudflare.com ruth.ns.cloudflare.com ruth.ns.cloudflare.com ruth.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 245ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.4.170	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.132.73	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

1 records 212ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	300s	mail.c16k.dk	185.62.188.4	cpanel.blazingfast.io	AS47674 Net Solutions - Consultoria Em Tecnologias De Informacao, Sociedade Unipessoal LDA

🔷 AAAA Records (IPv6)#

2 records 236ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3032::6815:4aa	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3037::ac43:8449	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 275ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.4.170,172.67.132.73 ech=AEX+DQBBUAAgACB5yo1uHPYFnhyeEH0/VQFJMCBy7AUPLw737f6vCcgyYAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3032::6815:4aa,2606:4700:3037::ac43:8449

📝 TXT Records#

1 records 502ms

TXT Record
v=spf1 +mx +a +ip4:185.62.188.4 ~all

✉️ SPF#

Policy	Record (c16k.dk)
~all (soft fail)	v=spf1 +mx +a +ip4:185.62.188.4 ~all

📨 DMARC#

Policy	Record (_dmarc.c16k.dk)
p=reject	v=DMARC1; p=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 2026-10-16 21:44:43

www	104.21.4.170 172.67.132.73 2606:4700:3032::6815:4aa 2606:4700:3037::ac43:8449 (AS13335) (address records, no CNAME)
www vs bare domain	Same network c16k.dk: 104.21.4.170 172.67.132.73 2606:4700:3032::6815:4aa 2606:4700:3037::ac43:8449 (AS13335) www.c16k.dk: 104.21.4.170 172.67.132.73 2606:4700:3032::6815:4aa 2606:4700:3037::ac43:8449 (AS13335)
Wildcard	No

✍️ DKIM keys#

1 found

Selector	CNAME	Key
default	—	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: 2/10 · policy: ~all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

379ms

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	2412555598
Primary NS (MNAME)	ivan.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-13 19:56:16

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2024-01-12
Expires	2027-01-11 (86d)

🔗 Same registrant#

14 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
arbejdsordre.dk	ONE.COM A/S
arbejdsordrer.dk	ONE.COM A/S
driftssystem.dk	ONE.COM A/S
fakturagrundlag.dk	ONE.COM A/S
felt-plan.dk	ONE.COM A/S
feltopgave.dk	ONE.COM A/S
feltplan.dk	ONE.COM A/S
feltrapport.dk	ONE.COM A/S
feltstyring.dk	ONE.COM A/S
fieldplan.dk	ONE.COM A/S
fotodokumentation.dk	ONE.COM A/S
servicearbejde.dk	ONE.COM A/S
serviceordre.dk	ONE.COM A/S
serviceordrer.dk	ONE.COM A/S

📋 WHOIS#

⏱️ Lookup Timing#

231ms

245ms

212ms

AAAA

236ms

TXT

502ms

CAA

214ms

HTTPS

275ms

TLSA

295ms

SOA

0ms

MTA-STS

296ms

DNSSEC

379ms

SRV

276ms

Total

4874ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-16 21:44:43	3036ms	2 NS 2 A 1 MX	🔓 Insecure
2026-10-15 20:57:12	564ms	2 NS 2 A 1 MX	🔓 Insecure
2026-10-14 19:56:56	884ms	2 NS 2 A 1 MX	🔓 Insecure
2026-10-13 19:39:27	568ms	2 NS 2 A 1 MX	🔓 Insecure
2026-10-07 03:49:33	1390ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-30 23:48:52	740ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-03 21:19:22	9500ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-19 05:54:50 shown	4874ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-16 22:36:13	1893ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-28 20:50:21	924ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-21 04:00:25	1019ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-19 14:26:44	3636ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-18 11:39:09	1289ms	2 NS 2 A 1 MX	⚠️ Bogus
2026-06-16 18:41:53	617ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-16 18:41:10	2659ms	2 NS 2 A 1 MX	🔓 Insecure