matematikoptur.dk

Records from scan: 2026-10-01 07:51:56 · 468ms total · last checked 2026-10-16 13:39 (unchanged)

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

matematikoptur.dk is a .dk domain served by 2 nameservers (ns1.curanet.dk, ns2.curanet.dk). It was registered on 18 October 2022 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.21.41.254 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by mx1.onlinemail.io, mx2.onlinemail.io. The zone is DNSSEC-signed and validates, publishes a 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 29ms

Nameserver	IP addresses	PTR	ASN / ISP
ns1.curanet.dk	185.25.141.12 2a02:2339:4006:108::123	ns1.curanet.dk ns1.curanet.dk	AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S
ns2.curanet.dk	2a02:2339:1:10f::123:123 91.197.248.75	ns2.curanet.dk ns2.curanet.dk	AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S

🌍 A Records#

1 records 33ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
185.21.41.254	3600s	linux32.curanet.dk	AS48854	team.blue Denmark A/S	185.21.40.0/22	🇩🇰 Denmark	—

📧 MX Records#

2 records 37ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	3600s	mx1.onlinemail.io	185.21.42.12	mx1.onlinemail.io	AS48854 team.blue Denmark A/S
20	3600s	mx2.onlinemail.io	46.36.208.16	mx2.onlinemail.io	AS48854 team.blue Denmark A/S

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	autodiscover-mf.onlinemail.io → 185.21.40.62
🔶 Autoconfig	autoconfig-mf.onlinemail.io → 185.21.40.62

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

1 records 175ms

TXT Record
v=spf1 include:spf.onlinemail.io -all

✉️ SPF#

Policy	Record (matematikoptur.dk)
-all (hard fail)	v=spf1 include:spf.onlinemail.io -all

📨 DMARC#

Policy	Record (_dmarc.matematikoptur.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#

checked 2026-10-08 15:34:50

www	185.21.41.254 (AS48854) (address records, no CNAME)
www vs bare domain	Same network matematikoptur.dk: 185.21.41.254 (AS48854) www.matematikoptur.dk: 185.21.41.254 (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

🔎 SPF check#

zone-wide SPF report

DNS lookups: 3/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

52ms

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

🏷️ SOA#

31ms

Field	Value
Serial	2023082502
Primary NS (MNAME)	ns1.curanet.dk
Responsible (RNAME)	hostmaster@curanet.dk
Refresh	14400s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	300s

📋 Registration#

WHOIS fetched 2026-10-10 07:12:42

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2022-10-18
Expires	2027-10-17 (364d)

📋 WHOIS#

⏱️ Lookup Timing#

29ms

33ms

37ms

AAAA

34ms

TXT

175ms

CAA

24ms

HTTPS

40ms

TLSA

50ms

SOA

31ms

MTA-STS

47ms

DNSSEC

52ms

SRV

55ms

Total

468ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-01 07:51:56 shown	468ms	2 NS 1 A 2 MX	🔒 Secure
2026-06-25 05:26:30	700ms	2 NS 1 A 2 MX	🔒 Secure
2026-06-19 09:07:38	608ms	2 NS 1 A 2 MX	🔒 Secure
2026-06-18 08:53:53	742ms	2 NS 1 A 2 MX	🔒 Secure