c16k.dk

📜 Historical scan 2026-06-18 11:39:09  ·  ← 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 DNSSEC-signed but currently fails validation, 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   66ms
NameserverIP addressesPTRASN / 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   77ms
IPTTLPTRASNISP / OrgCIDRCountryCity
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   44ms
PriorityTTLMail ServerIP addressesPTRASN
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   62ms
IPv6 AddressTTLPTRASNISP / OrgCIDRCountryCity
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   55ms
PriorityTargetSvcParams
1 service . alpn="h3,h2" ipv4hint=104.21.4.170,172.67.132.73 ech=AEX+DQBB4wAgACCVyKcCs9u44dWtkLzS6nE+sJ9SENL5c56DbEkFrdTMBgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3032::6815:4aa,2606:4700:3032::ac43:8449

📝 TXT Records#

1 records   261ms
TXT Record
v=spf1 +mx +a +ip4:185.62.188.4 ~all

✉️ SPF#

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

📨 DMARC#

PolicyRecord (_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
www104.21.4.170 172.67.132.73 2606:4700:3032::6815:4aa 2606:4700:3037::ac43:8449 (AS13335) (address records, no CNAME)
www vs bare domainSame network
WildcardNo

✍️ DKIM keys#

1 found
SelectorCNAMEKey
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

🔏 ACME Challenge#

TypeNameValue
TXT _acme-challenge.c16k.dk TaqpqeGZPF98ENfjP-TFbLdnR3ovAL00LJZfcVLjP7M
TXT _acme-challenge.c16k.dk iPXuYNGO_XXZYpDr8_m_XgxnGB0Zxz1sSVNWoXD1eXQ

🔗 TLSA / DANE#

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

🔐 DNSSEC#

116ms
CheckResult
Validation Status⚠️ Bogus
AD Flag (resolver validates)✗ Not set
DS Record✗ Not found
DNSKEY Record✗ Not found
Flagsbroken trust chain resolving 'c16k.dk/A/IN': 127.0.0.1#53

🏷️ SOA#

0ms
FieldValue
Serial2407138970
Primary NS (MNAME)ivan.ns.cloudflare.com
Responsible (RNAME)dns@cloudflare.com
Refresh10000s
Retry2400s
Expire604800s
Minimum (neg-cache TTL)1800s

📋 Registration#

WHOIS fetched 2026-10-13 19:56:16
FieldValue
RegistrarPunktum dk A/S (direct)
Registered2024-01-12
Expires2027-01-11 (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).

DomainRegistrar
arbejdsordre.dkONE.COM A/S
arbejdsordrer.dkONE.COM A/S
driftssystem.dkONE.COM A/S
fakturagrundlag.dkONE.COM A/S
felt-plan.dkONE.COM A/S
feltopgave.dkONE.COM A/S
feltplan.dkONE.COM A/S
feltrapport.dkONE.COM A/S
feltstyring.dkONE.COM A/S
fieldplan.dkONE.COM A/S
fotodokumentation.dkONE.COM A/S
servicearbejde.dkONE.COM A/S
serviceordre.dkONE.COM A/S
serviceordrer.dkONE.COM A/S
📋 WHOIS#

⏱️ Lookup Timing#

NS
66ms
A
77ms
MX
44ms
AAAA
62ms
TXT
261ms
CAA
35ms
HTTPS
55ms
TLSA
290ms
SOA
0ms
MTA-STS
79ms
DNSSEC
116ms
SRV
115ms
Total
1289ms

🕐 Scan History#

Scanned AtDurationRecordsDNSSEC
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 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 shown 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
dhd.dk [/] search Domains, Hosts & DNS — .dk zone