kryptoundervisning.dk

📜 Historical scan 2026-09-22 10:30:41 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

kryptoundervisning.dk is a .dk domain served by 2 nameservers (agustin.ns.cloudflare.com, venus.ns.cloudflare.com). It was registered on 20 January 2023 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.30.135 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 110ms

Nameserver	IP addresses	PTR	ASN / ISP
agustin.ns.cloudflare.com	108.162.195.90 162.159.44.90 172.64.35.90 2606:4700:58::a29f:2c5a 2803:f800:50::6ca2:c35a 2a06:98c1:50::ac40:235a	agustin.ns.cloudflare.com agustin.ns.cloudflare.com agustin.ns.cloudflare.com agustin.ns.cloudflare.com agustin.ns.cloudflare.com agustin.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
venus.ns.cloudflare.com	108.162.192.235 172.64.32.235 173.245.58.235 2606:4700:50::adf5:3aeb 2803:f800:50::6ca2:c0eb 2a06:98c1:50::ac40:20eb	venus.ns.cloudflare.com venus.ns.cloudflare.com venus.ns.cloudflare.com venus.ns.cloudflare.com venus.ns.cloudflare.com venus.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 142ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.30.135	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.172.244	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

📧

No MX records found

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	172.67.172.244
🔶 Autoconfig	104.21.30.135

🔷 AAAA Records (IPv6)#

2 records 123ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3030::6815:1e87	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3037::ac43:acf4	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 133ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.30.135,172.67.172.244 ech=AEX+DQBBZgAgACALc/2W3yZbSPXok6+FY5OhnCfxBrUF1cwJCUIQ5IRGKwAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::6815:1e87,2606:4700:3037::ac43:acf4

📝 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 2026-10-17 06:19:54

www	104.21.30.135 172.67.172.244 2606:4700:3030::6815:1e87 2606:4700:3037::ac43:acf4 (AS13335) (address records, no CNAME)
www vs bare domain	Same network kryptoundervisning.dk: 104.21.30.135 172.67.172.244 2606:4700:3030::6815:1e87 2606:4700:3037::ac43:acf4 (AS13335) www.kryptoundervisning.dk: 104.21.30.135 172.67.172.244 2606:4700:3030::6815:1e87 2606:4700:3037::ac43:acf4 (AS13335)
Wildcard	Yes: any name under the zone resolves

🔗 TLSA / DANE#

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

🔐 DNSSEC#

303ms

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	2415410338
Primary NS (MNAME)	agustin.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-09-30 19:21:24

Field	Value
Registrar	Simply.com A/S
Registered	2023-01-20
Expires	2027-01-19 (87d)

📋 WHOIS#

⏱️ Lookup Timing#

110ms

142ms

126ms

AAAA

123ms

TXT

285ms

CAA

120ms

HTTPS

133ms

TLSA

376ms

SOA

0ms

MTA-STS

125ms

DNSSEC

303ms

SRV

154ms

Total

1376ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-01 18:42:56	671ms	2 NS 2 A 0 MX	🔓 Insecure
2026-09-30 18:33:00	661ms	2 NS 2 A 0 MX	🔓 Insecure
2026-09-29 18:28:10	470ms	2 NS 2 A 0 MX	🔓 Insecure
2026-09-22 10:30:41 shown	1376ms	2 NS 2 A 0 MX	🔓 Insecure
2026-08-27 21:37:37	735ms	2 NS 2 A 0 MX	🔓 Insecure
2026-08-09 20:12:53	1127ms	2 NS 2 A 0 MX	🔓 Insecure
2026-07-23 18:09:33	806ms	2 NS 2 A 0 MX	🔓 Insecure
2026-06-28 04:57:43	673ms	2 NS 2 A 0 MX	🔓 Insecure
2026-06-25 19:12:03	907ms	2 NS 2 A 0 MX	🔓 Insecure
2026-06-25 11:25:41	2714ms	2 NS 2 A 0 MX	🔓 Insecure
2026-06-18 03:19:32	774ms	2 NS 2 A 0 MX	🔓 Insecure
2026-06-18 02:58:27	713ms	2 NS 2 A 0 MX	🔓 Insecure