c16k.dk

📜 Historical scan 2026-06-28 20:50:21 · ← 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 32ms

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 41ms

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 41ms

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 33ms

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	—	—
2606:4700:3032::ac43:8449	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 36ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.4.170,172.67.132.73 ech=AEX+DQBB+wAgACDfNj0YRKJr4DYWks5qn/EN9d3umaFGYNofRG0PZwq3QgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3032::6815:4aa,2606:4700:3032::ac43:8449

📝 TXT Records#

1 records 194ms

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#

76ms

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

🏷️ SOA#

30ms

Field	Value
Serial	2407444121
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#

32ms

41ms

AAAA

33ms

TXT

194ms

CAA

32ms

HTTPS

36ms

TLSA

68ms

SOA

30ms

MTA-STS

47ms

DNSSEC

76ms

SRV

49ms

Total

924ms

🕐 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	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 shown	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