linux101.dk

📜 Historical scan 2026-08-17 11:47:50 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

linux101.dk is a .dk domain served by 2 nameservers (curt.ns.cloudflare.com, marge.ns.cloudflare.com). It was registered on 31 May 2025 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.26.63 is hosted by Cloudflare, Inc. (AS13335). The zone is not DNSSEC-signed, has no 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 227ms

Nameserver	IP addresses	PTR	ASN / ISP
curt.ns.cloudflare.com	108.162.193.94 172.64.33.94 173.245.59.94 2606:4700:58::adf5:3b5e 2803:f800:50::6ca2:c15e 2a06:98c1:50::ac40:215e	curt.ns.cloudflare.com curt.ns.cloudflare.com curt.ns.cloudflare.com curt.ns.cloudflare.com curt.ns.cloudflare.com curt.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
marge.ns.cloudflare.com	108.162.192.191 172.64.32.191 173.245.58.191 2606:4700:50::adf5:3abf 2803:f800:50::6ca2:c0bf 2a06:98c1:50::ac40:20bf	marge.ns.cloudflare.com marge.ns.cloudflare.com marge.ns.cloudflare.com marge.ns.cloudflare.com marge.ns.cloudflare.com marge.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 225ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.26.63	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.135.147	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

📧

No MX records found

🔷 AAAA Records (IPv6)#

2 records 250ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3030::6815:1a3f	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3031::ac43:8793	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 232ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.26.63,172.67.135.147 ech=AEX+DQBBNgAgACAq8L6wkKEiR0iv4uVV/YJ0L0MtRm8Qq81Af4afE4WmJgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::6815:1a3f,2606:4700:3031::ac43:8793

📝 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#

latest probe, not this scan · checked 2026-10-16 06:37:11

www	104.21.26.63 172.67.135.147 2606:4700:3030::6815:1a3f 2606:4700:3031::ac43:8793 (AS13335) (address records, no CNAME)
www vs bare domain	Same network linux101.dk: 104.21.26.63 172.67.135.147 2606:4700:3030::6815:1a3f 2606:4700:3031::ac43:8793 (AS13335) www.linux101.dk: 104.21.26.63 172.67.135.147 2606:4700:3030::6815:1a3f 2606:4700:3031::ac43:8793 (AS13335)
Wildcard	No

🔏 ACME Challenge#

Type	Name	Value
TXT	_acme-challenge.linux101.dk	p6peKmeokotDHpbsTOoVusUG4xrriypz81R8riGr548
TXT	_acme-challenge.linux101.dk	vejw_P9PY7zxvETwnbTsIrHmGhY3O_Xby_OtV0EDXrU

🔗 TLSA / DANE#

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

🔐 DNSSEC#

332ms

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	2412331316
Primary NS (MNAME)	curt.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-16 06:47:12

Field	Value
Registrar	Key-Systems GmbH
Registered	2025-05-31
Expires	2027-05-30 (221d)

📋 WHOIS#

⏱️ Lookup Timing#

227ms

225ms

207ms

AAAA

250ms

TXT

427ms

CAA

202ms

HTTPS

232ms

TLSA

138ms

SOA

0ms

MTA-STS

276ms

DNSSEC

332ms

SRV

262ms

Total

1593ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-16 06:37:11	672ms	2 NS 2 A 0 MX	🔓 Insecure
2026-09-17 17:58:29	1347ms	2 NS 2 A 0 MX	🔓 Insecure
2026-08-28 09:46:46	1090ms	2 NS 2 A 0 MX	🔓 Insecure
2026-08-19 17:02:19	4141ms	2 NS 2 A 0 MX	🔓 Insecure
2026-08-17 11:47:50 shown	1593ms	2 NS 2 A 0 MX	🔓 Insecure
2026-07-19 08:00:19	2745ms	2 NS 2 A 0 MX	🔓 Insecure
2026-06-18 03:38:07	23461ms	2 NS 2 A 0 MX	🔓 Insecure
2026-06-18 00:06:44	3283ms	2 NS 2 A 0 MX	🔓 Insecure