supermatematik.dk

📜 Historical scan 2026-06-18 07:41:35 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

supermatematik.dk is a .dk domain served by 2 nameservers (ns.dandomain.dk, ns2.dandomain.dk). It was registered on 22 April 2018 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 89.188.76.144 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by mail.supermatematik.dk. The zone is DNSSEC-signed and validates, publishes a DMARC policy and has no IPv6 address. 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 202ms

Nameserver	IP addresses	PTR	ASN / ISP
ns.dandomain.dk	185.25.141.3 2a02:2339:4006:109::dd	ns.dandomain.dk ns.dandomain.dk	AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S
ns2.dandomain.dk	2a02:2339:1:108::dd:dd 91.197.248.66	ns2.dandomain.dk ns2.dandomain.dk	AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S

🌍 A Records#

1 records 204ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
89.188.76.144	—	mail.supermatematik.dk	AS48854	team.blue Denmark A/S	89.188.72.0/21	🇩🇰 Denmark	—

📧 MX Records#

1 records 204ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	—	mail.supermatematik.dk	89.188.76.144	mail.supermatematik.dk	AS48854 team.blue Denmark A/S

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	89.188.76.144
🔶 Autoconfig	89.188.76.144

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

1 records 430ms

TXT Record
v=spf1 a mx -all

✉️ SPF#

Policy	Record (supermatematik.dk)
-all (hard fail)	v=spf1 a mx -all

📨 DMARC#

Policy	Record (_dmarc.supermatematik.dk)
p=none (monitor only)	v=DMARC1; p=none

📬 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 2026-10-15 02:54:46

www	89.188.76.144 (AS48854) (address records, no CNAME)
www vs bare domain	Same network supermatematik.dk: 89.188.76.144 (AS48854) www.supermatematik.dk: 89.188.76.144 (AS48854)
Wildcard	Yes: any name under the zone resolves
Denial of existence	NSEC3 · 1 iteration · 1-byte salt RFC 9276 recommends 0 iterations and no salt
CDS / CDNSKEY	None 0 CDS, 0 CDNSKEY

✍️ DKIM keys#

1 found

Selector	CNAME	Key
default	—	RSA · ~1024 bit below 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

🔗 TLSA / DANE#

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

🔐 DNSSEC#

354ms

Check	Result
Validation Status	🔒 Secure
AD Flag (resolver validates)	✓ Set
DS Record	✓ Found
DNSKEY Record	✓ Found
Flags	fully validated

🏷️ SOA#

203ms

Field	Value
Serial	2026060304
Primary NS (MNAME)	ns.dandomain.dk
Responsible (RNAME)	hostmaster@dandomain.dk
Refresh	14400s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	300s

📋 Registration#

WHOIS fetched 2026-10-09 21:13:54

Field	Value
Registrar	DANDOMAIN A/S
Registered	2018-04-22
Expires	2028-04-30 (555d)

📋 WHOIS#

⏱️ Lookup Timing#

202ms

204ms

AAAA

203ms

TXT

430ms

CAA

202ms

HTTPS

202ms

TLSA

162ms

SOA

203ms

MTA-STS

2058ms

DNSSEC

354ms

SRV

339ms

Total

2534ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-09-30 13:58:53	481ms	2 NS 1 A 1 MX	🔒 Secure
2026-09-29 17:37:13	362ms	2 NS 1 A 1 MX	🔒 Secure
2026-09-29 14:43:59	1438ms	2 NS 1 A 1 MX	🔒 Secure
2026-09-09 07:26:27	435ms	2 NS 1 A 1 MX	🔒 Secure
2026-08-26 07:00:42	750ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-25 23:32:55	1402ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-18 07:41:35 shown	2534ms	2 NS 1 A 1 MX	🔒 Secure