optimize.dk

📜 Historical scan 2026-06-17 22:46:18 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

optimize.dk is a .dk domain served by 2 nameservers (ns1.efclausen.dk, ns2.efclausen.dk). It was registered on 3 October 2002 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.21.40.251 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by optimize-dk.mail.protection.outlook.com. 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 62ms

Nameserver	IP addresses	PTR	ASN / ISP
ns1.efclausen.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.efclausen.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 94ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
185.21.40.251	—	linux8.curanet.dk	AS48854	team.blue Denmark A/S	185.21.40.0/22	🇩🇰 Denmark	—

📧 MX Records#

1 records 37ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	—	optimize-dk.mail.protection.outlook.com	2a01:111:f403:ca09:: 2a01:111:f403:ca09::7 2a01:111:f403:ca09::9 2a01:111:f403:ca09::f 52.101.68.0 52.101.68.29 52.101.68.39 52.101.73.26	mail-am3pr04cu00500.inbound.protection.outlook.com mail-am9pr04cu00107.inbound.protection.outlook.com mail-as8pr04cu00801.inbound.protection.outlook.com mail-am7pr05cu00307.inbound.protection.outlook.com mail-db3pr0202cu00100.inbound.protection.outlook.com mail-dbapr03cu00105.inbound.protection.outlook.com mail-db7pr03cu00607.inbound.protection.outlook.com mail-as9pr05cu01302.inbound.protection.outlook.com	AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	autodiscover.outlook.com → 40.104.116.40
🔶 Autoconfig	185.21.42.35

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

2 records 205ms

TXT Record
google-site-verification=VybJQ8YikNdK3mEeN6m_506bHyKOjNR_Mp9hDR62YoI
v=spf1 include:spf.protection.outlook.com -all

✉️ SPF#

Policy	Record (optimize.dk)
-all (hard fail)	v=spf1 include:spf.protection.outlook.com -all

📨 DMARC#

Policy	Record (_dmarc.optimize.dk)
p=reject	v=DMARC1; p=reject; pct=100; fo=1

📬 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 19:22:18

www CNAME	optimize.dk (all on optimize.dk) → 185.21.40.251 (AS48854)
www vs bare domain	Same network optimize.dk: 185.21.40.251 (AS48854) www.optimize.dk: 185.21.40.251 (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
selector1	selector1-optimize-dk._domainkey.optimizedk.onmicrosoft.com	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: 1/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

75ms

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

🏷️ SOA#

115ms

Field	Value
Serial	2026041301
Primary NS (MNAME)	ns1.efclausen.dk
Responsible (RNAME)	hostmaster@curanet.dk
Refresh	14400s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	300s

📋 Registration#

WHOIS fetched 2026-10-17 18:55:14

Field	Value
Registrar	CURANET A/S
Registered	2002-10-03
Expires	2026-12-31 (74d)

🔗 Same registrant#

1 domain

Other .dk domains whose WHOIS registrant has the same name and postal address. Matched on a keyed hash: the registrant's details are not stored or shown. Covers only domains whose WHOIS we have fetched (refreshed about monthly).

Domain	Registrar
expressrevisor.dk	CURANET A/S

📋 WHOIS#

⏱️ Lookup Timing#

62ms

94ms

37ms

AAAA

64ms

TXT

205ms

CAA

81ms

HTTPS

123ms

TLSA

137ms

SOA

115ms

MTA-STS

36ms

DNSSEC

75ms

SRV

168ms

Total

3796ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-01 18:21:26	946ms	2 NS 1 A 1 MX	🔒 Secure
2026-09-30 18:06:29	1007ms	2 NS 1 A 1 MX	🔒 Secure
2026-08-27 01:55:10	1106ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-27 02:41:29	857ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-25 12:06:26	1049ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-24 18:51:32	731ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-22 01:03:37	996ms	0 NS 0 A 0 MX	❓ Unknown
2026-06-21 06:45:39	765ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-19 19:01:09	1279ms	2 NS 1 A 1 MX	⚠️ Bogus
2026-06-17 22:46:18 shown	3796ms	2 NS 1 A 1 MX	🔒 Secure