opto.dk

📜 Historical scan 2026-09-20 21:09:16 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

opto.dk is a .dk domain served by 2 nameservers (ns.dandomain.dk, ns2.dandomain.dk). It was registered on 1 April 1998 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 35.241.247.115 is hosted by Google LLC (AS396982) in Belgium. Mail is handled by aspmx.l.google.com, alt1.aspmx.l.google.com and 3 more. The zone is DNSSEC-signed and validates, has no 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 35ms

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 34ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
35.241.247.115	3600s	115.247.241.35.bc.googleusercontent.com	AS396982	Google LLC	35.240.0.0/13	🇧🇪 Belgium	Brussels

📧 MX Records#

5 records 31ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
1	3600s	aspmx.l.google.com	2a00:1450:4010:c05::1b 2a00:1450:4010:c05::1b 74.125.205.26	li-in-x1b.1e100.net li-in-f27.1e100.net le-in-f26.1e100.net	AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC
5	3600s	alt1.aspmx.l.google.com	192.178.158.27 2404:6800:4013:813::1b	lcdels-in-f27.1e100.net lcdels-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC
5	3600s	alt2.aspmx.l.google.com	173.194.41.27 173.194.41.27 2404:6800:4001:c01::1b	yukulwh-in-f27.1e100.net mad01s14-in-f27.1e100.net yukulwh-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC
10	3600s	alt3.aspmx.l.google.com	172.253.158.26 2404:6800:4003:c26::1b	so-in-f26.1e100.net so-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC
10	3600s	alt4.aspmx.l.google.com	108.177.125.26 2404:6800:4008:c01::1a	tp-in-f26.1e100.net tp-in-f26.1e100.net	AS15169 Google LLC AS15169 Google LLC

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 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 2026-10-09 08:07:10

www	35.241.247.115 (AS396982) (address records, no CNAME)
www vs bare domain	Same network opto.dk: 35.241.247.115 (AS396982) www.opto.dk: 35.241.247.115 (AS396982)
Wildcard	No
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
google	—	RSA · ~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.

🔗 TLSA / DANE#

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

🔐 DNSSEC#

79ms

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

🏷️ SOA#

0ms

Field	Value
Serial	2018110500
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 08:33:22

Field	Value
Registrar	DANDOMAIN A/S
Registered	1998-04-01
Expires	2027-06-30 (256d)

📋 WHOIS#

⏱️ Lookup Timing#

35ms

34ms

31ms

AAAA

33ms

TXT

127ms

CAA

47ms

HTTPS

43ms

TLSA

116ms

SOA

0ms

MTA-STS

43ms

DNSSEC

79ms

SRV

48ms

Total

652ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-09 08:07:10	1055ms	2 NS 1 A 5 MX	🔒 Secure
2026-10-04 03:52:33	474ms	2 NS 1 A 5 MX	🔒 Secure
2026-09-27 06:57:44	626ms	2 NS 1 A 5 MX	🔒 Secure
2026-09-20 21:09:16 shown	652ms	2 NS 1 A 5 MX	🔒 Secure
2026-08-28 04:13:44	2678ms	2 NS 1 A 5 MX	🔒 Secure
2026-07-02 21:15:12	699ms	2 NS 1 A 5 MX	🔒 Secure
2026-06-21 19:01:50	580ms	2 NS 1 A 5 MX	🔒 Secure
2026-06-19 17:21:56	560ms	2 NS 1 A 5 MX	🔒 Secure
2026-06-17 13:54:39	2404ms	2 NS 1 A 5 MX	🔒 Secure