teachertool.dk

📜 Historical scan 2026-08-06 11:02:23 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

teachertool.dk is a .dk domain served by 2 nameservers (dilbert.ns.cloudflare.com, lana.ns.cloudflare.com). It was registered on 23 November 2025 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.61.52 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mx.simply.com. 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 33ms

Nameserver	IP addresses	PTR	ASN / ISP
dilbert.ns.cloudflare.com	108.162.193.155 172.64.33.155 173.245.59.155 2606:4700:58::adf5:3b9b 2803:f800:50::6ca2:c19b 2a06:98c1:50::ac40:219b	dilbert.ns.cloudflare.com dilbert.ns.cloudflare.com dilbert.ns.cloudflare.com dilbert.ns.cloudflare.com dilbert.ns.cloudflare.com dilbert.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
lana.ns.cloudflare.com	108.162.192.182 172.64.32.182 173.245.58.182 2606:4700:50::adf5:3ab6 2803:f800:50::6ca2:c0b6 2a06:98c1:50::ac40:20b6	lana.ns.cloudflare.com lana.ns.cloudflare.com lana.ns.cloudflare.com lana.ns.cloudflare.com lana.ns.cloudflare.com lana.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 65ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.61.52	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.206.125	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

1 records 40ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	300s	mx.simply.com	94.231.106.20	mx.simply.com	AS48854 team.blue Denmark A/S

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔶 Autoconfig	172.67.206.125

🔷 AAAA Records (IPv6)#

2 records 41ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3030::6815:3d34	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3033::ac43:ce7d	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 51ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.61.52,172.67.206.125 ech=AEX+DQBB5gAgACCCLTNPUKchD35Lp9JpVQJcE7AcxMh3glCyn+p+bl+aaAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::6815:3d34,2606:4700:3033::ac43:ce7d

🔌 SRV Records#

1 records 88ms

Service	Priority	Weight	Port	Target
_autodiscover._tcp	10	10	443	maildiscover.simply.com

📝 TXT Records#

1 records 212ms

TXT Record
v=spf1 include:spf.simply.com -all

✉️ SPF#

Policy	Record (teachertool.dk)
-all (hard fail)	v=spf1 include:spf.simply.com -all

📨 DMARC#

Policy	Record (_dmarc.teachertool.dk)
p=reject	v=DMARC1; p=reject;

📬 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 2026-10-07 19:17:36

www	104.21.61.52 172.67.206.125 2606:4700:3030::6815:3d34 2606:4700:3033::ac43:ce7d (AS13335) (address records, no CNAME)
www vs bare domain	Same network teachertool.dk: 104.21.61.52 172.67.206.125 2606:4700:3030::6815:3d34 2606:4700:3033::ac43:ce7d (AS13335) www.teachertool.dk: 104.21.61.52 172.67.206.125 2606:4700:3030::6815:3d34 2606:4700:3033::ac43:ce7d (AS13335)
Wildcard	No

🔎 SPF check#

zone-wide SPF report

DNS lookups: 1/10 · policy: -all

No problems found

🔗 TLSA / DANE#

2 records 70ms

Service / Owner	Type	Cert association
SMTP _25._tcp.mx.simply.com	DANE-EE · SPKI · SHA-256	A9D603AF4D7ED6B9246B4B68500CD6F2…
SMTP _25._tcp.mx.simply.com	DANE-EE · SPKI · SHA-256	97A3BA009F39C761BFFB6574340E8138…

🔐 DNSSEC#

112ms

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	2411436687
Primary NS (MNAME)	dilbert.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-04 17:39:16

Field	Value
Registrar	Simply.com A/S
Registered	2025-11-23
Expires	2026-11-22 (34d)

📋 WHOIS#

⏱️ Lookup Timing#

33ms

65ms

40ms

AAAA

41ms

TXT

212ms

CAA

45ms

HTTPS

51ms

TLSA

70ms

SOA

0ms

MTA-STS

89ms

DNSSEC

112ms

SRV

88ms

Total

1797ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-07 19:17:36	1151ms	2 NS 2 A 3 MX	🔓 Insecure
2026-10-04 17:02:26	685ms	2 NS 2 A 3 MX	🔓 Insecure
2026-10-03 16:58:25	740ms	2 NS 2 A 3 MX	🔓 Insecure
2026-09-30 16:50:12	679ms	2 NS 2 A 3 MX	🔓 Insecure
2026-09-30 02:23:21	839ms	2 NS 2 A 3 MX	🔓 Insecure
2026-08-21 11:16:08	10320ms	2 NS 2 A 3 MX	🔓 Insecure
2026-08-20 10:47:02	2336ms	2 NS 2 A 3 MX	🔓 Insecure
2026-08-14 05:08:21	4195ms	2 NS 2 A 3 MX	🔓 Insecure
2026-08-10 08:58:10	1964ms	2 NS 2 A 3 MX	🔓 Insecure
2026-08-08 22:00:02	2193ms	2 NS 2 A 3 MX	🔓 Insecure
2026-08-06 11:02:23 shown	1797ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-30 20:14:54	912ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-18 00:04:03	3139ms	2 NS 2 A 1 MX	🔓 Insecure