ctf-chal.dk

Records from scan: 2026-10-09 02:54:32 · 490ms total · last checked 2026-10-16 16:24 (unchanged)

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

ctf-chal.dk is a .dk domain served by 2 nameservers (brenda.ns.cloudflare.com, randy.ns.cloudflare.com). It was registered on 2 December 2024 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. The zone is DNSSEC-signed and validates, has no DMARC policy and has no IPv6 address. Below are all of its DNS records from our latest scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.

🖥️ Nameservers#

2 records 37ms

Nameserver	IP addresses	PTR	ASN / ISP
brenda.ns.cloudflare.com	108.162.192.77 172.64.32.77 173.245.58.77 2606:4700:50::adf5:3a4d 2803:f800:50::6ca2:c04d 2a06:98c1:50::ac40:204d	brenda.ns.cloudflare.com brenda.ns.cloudflare.com brenda.ns.cloudflare.com brenda.ns.cloudflare.com brenda.ns.cloudflare.com brenda.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
randy.ns.cloudflare.com	108.162.195.109 162.159.44.109 172.64.35.109 2606:4700:58::a29f:2c6d 2803:f800:50::6ca2:c36d 2a06:98c1:50::ac40:236d	randy.ns.cloudflare.com randy.ns.cloudflare.com randy.ns.cloudflare.com randy.ns.cloudflare.com randy.ns.cloudflare.com randy.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.

🌍 A Records#

🌍

No A records found

📧 MX Records#

📧

No MX records found

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

📝

No TXT records found

✉️ SPF#

✗ No SPF record — mail spoofing not restricted

📨 DMARC#

✗ No DMARC record — mail spoofing not restricted

📬 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#

checked 2026-10-09 02:54:32

www	Exists, no address
www vs bare domain	Neither resolves ctf-chal.dk: no address www.ctf-chal.dk: no address
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

🔗 TLSA / DANE#

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

🔐 DNSSEC#

133ms

Check	Result
Validation Status	🔒 Secure
AD Flag (resolver validates)	✓ Set
DS Record	✓ Found
DNSKEY Record	✓ Found
Flags	resolution failed: ncache nxrrset

🏷️ SOA#

32ms

Field	Value
Serial	2416941216
Primary NS (MNAME)	brenda.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-05 21:50:42

Field	Value
Registrar	Domænehajen ApS
Registered	2024-12-02
Expires	2026-12-01 (45d)

📋 WHOIS#

⏱️ Lookup Timing#

37ms

39ms

36ms

AAAA

45ms

TXT

158ms

CAA

41ms

HTTPS

37ms

TLSA

43ms

SOA

32ms

MTA-STS

54ms

DNSSEC

133ms

SRV

73ms

Total

490ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-09 02:54:32 shown	490ms	2 NS 0 A 0 MX	🔒 Secure
2026-10-05 21:39:09	1710ms	2 NS 0 A 0 MX	🔒 Secure
2026-09-30 21:20:19	2380ms	2 NS 0 A 0 MX	🔒 Secure
2026-09-25 03:08:15	518ms	2 NS 0 A 0 MX	🔒 Secure
2026-09-24 02:32:49	1135ms	2 NS 0 A 0 MX	🔒 Secure
2026-09-05 12:53:55	534ms	2 NS 0 A 0 MX	🔒 Secure
2026-09-03 17:53:10	391ms	2 NS 0 A 0 MX	🔒 Secure
2026-08-25 01:11:56	1420ms	2 NS 0 A 0 MX	🔒 Secure
2026-08-10 15:44:44	2971ms	2 NS 0 A 0 MX	🔒 Secure
2026-07-23 08:17:51	1500ms	2 NS 0 A 0 MX	🔒 Secure
2026-07-15 08:47:08	937ms	2 NS 0 A 0 MX	🔒 Secure
2026-06-28 21:20:47	727ms	2 NS 0 A 0 MX	🔒 Secure
2026-06-22 15:44:02	2101ms	2 NS 0 A 0 MX	🔒 Secure
2026-06-20 00:34:19	462ms	2 NS 0 A 0 MX	🔒 Secure
2026-06-16 23:10:13	399ms	2 NS 0 A 0 MX	🔒 Secure