opt.dk

📜 Historical scan 2026-08-21 08:28:02 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

opt.dk is a .dk domain served by 2 nameservers (nico.ns.cloudflare.com, stephane.ns.cloudflare.com). It was registered on 20 August 2018 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.21.138 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by .. 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 91ms

Nameserver	IP addresses	PTR	ASN / ISP
nico.ns.cloudflare.com	108.162.195.147 162.159.44.147 172.64.35.147 2606:4700:58::a29f:2c93 2803:f800:50::6ca2:c393 2a06:98c1:50::ac40:2393	nico.ns.cloudflare.com nico.ns.cloudflare.com nico.ns.cloudflare.com nico.ns.cloudflare.com nico.ns.cloudflare.com nico.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
stephane.ns.cloudflare.com	108.162.194.112 162.159.38.112 172.64.34.112 2606:4700:50::a29f:2670 2803:f800:50::6ca2:c270 2a06:98c1:50::ac40:2270	stephane.ns.cloudflare.com stephane.ns.cloudflare.com stephane.ns.cloudflare.com stephane.ns.cloudflare.com stephane.ns.cloudflare.com stephane.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 83ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.21.138	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.199.24	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

1 records 63ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	300s	. Null MX — domain accepts no email (RFC 7505)

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	172.67.199.24
🔶 Autoconfig	172.67.199.24

🔷 AAAA Records (IPv6)#

2 records 90ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3033::6815:158a	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3037::ac43:c718	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 74ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.21.138,172.67.199.24 ech=AEX+DQBBbwAgACCAaeV+QS5p5xbXEQGxi8tkUvu8MtGmPvK64VRaUALPcQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3033::6815:158a,2606:4700:3037::ac43:c718

📝 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 2026-10-08 01:13:24

www	104.21.21.138 172.67.199.24 2606:4700:3033::6815:158a 2606:4700:3037::ac43:c718 (AS13335) (address records, no CNAME)
www vs bare domain	Same network opt.dk: 104.21.21.138 172.67.199.24 2606:4700:3033::6815:158a 2606:4700:3037::ac43:c718 (AS13335) www.opt.dk: 104.21.21.138 172.67.199.24 2606:4700:3033::6815:158a 2606:4700:3037::ac43:c718 (AS13335)
Wildcard	Yes: any name under the zone resolves
CDS / CDNSKEY	Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY

🔗 TLSA / DANE#

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

🔐 DNSSEC#

231ms

Check	Result
Validation Status	🔓 Insecure
AD Flag (resolver validates)	✗ Not set
DS Record	✗ Not found
DNSKEY Record	✓ Found
Flags	unsigned answer

🏷️ SOA#

0ms

Field	Value
Serial	2412700009
Primary NS (MNAME)	nico.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-08 01:30:48

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2018-08-20
Expires	2027-08-31 (317d)

📋 WHOIS#

⏱️ Lookup Timing#

91ms

83ms

63ms

AAAA

90ms

TXT

285ms

CAA

91ms

HTTPS

74ms

TLSA

380ms

SOA

0ms

MTA-STS

107ms

DNSSEC

231ms

SRV

130ms

Total

1722ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-08 01:13:23	2462ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-30 23:34:36	495ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-30 06:03:01	692ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-19 14:35:40	1262ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-12 11:42:50	1342ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-07 22:41:23	1894ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-21 08:28:02 shown	1722ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-01 11:27:05	959ms	2 NS 2 A 1 MX	🔓 Insecure
2026-07-27 13:09:12	9383ms	2 NS 2 A 1 MX	🔓 Insecure
2026-07-11 05:43:49	8735ms	2 NS 2 A 1 MX	🔓 Insecure
2026-07-03 19:51:10	1322ms	2 NS 2 A 1 MX	🔓 Insecure
2026-07-02 07:20:51	1988ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-18 03:52:28	2684ms	2 NS 2 A 0 MX	🔓 Insecure