optisyn.dk

📜 Historical scan 2026-06-17 12:59:03 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

optisyn.dk is a .dk domain served by 3 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com). It was registered on 5 February 2025 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 93.191.156.141 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by optisyn-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#

3 records 85ms

Nameserver	IP addresses	PTR	ASN / ISP
ns1.simply.com	2a02:2339:1:15c::4562:4562 91.197.248.78	ns1.simply.com ns1.simply.com	AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S
ns2.simply.com	185.25.141.15 2a02:2339:4006:101::4562:4562	ns2.simply.com ns2.simply.com	AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S
ns3.simply.com	91.197.248.79	ns3.simply.com	AS48854 team.blue Denmark A/S

🌍 A Records#

1 records 68ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
93.191.156.141	—	linux256.unoeuro.com	AS48854	team.blue Denmark A/S	93.191.152.0/21	🇩🇰 Denmark	—

📧 MX Records#

1 records 77ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	—	optisyn-dk.mail.protection.outlook.com	2a01:111:f403:ca04::e 2a01:111:f403:ca09::8 2a01:111:f403:ca09::c 2a01:111:f403:ca09::f 52.101.68.12 52.101.68.21 52.101.68.39 52.101.73.11	mail-db8pr02cu00106.inbound.protection.outlook.com mail-as2pr05cu00100.inbound.protection.outlook.com mail-as8pr05cu00304.inbound.protection.outlook.com mail-am7pr05cu00307.inbound.protection.outlook.com mail-db9pr02cu00204.inbound.protection.outlook.com mail-db4pr02cu00205.inbound.protection.outlook.com mail-db7pr03cu00607.inbound.protection.outlook.com mail-am1pr04cu00103.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

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

3 records 148ms

TXT Record
MS=ms79009288
P-LvUjL9z2uE
v=spf1 include:spf.protection.outlook.com include:spf.permido.com -all

✉️ SPF#

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

📨 DMARC#

Policy	Record (_dmarc.optisyn.dk)
p=quarantine	v=DMARC1; p=quarantine; rua=mailto:dmarc@optisyndk; ruf=mailto:dmarc@optisyn.dk; sp=quarantine; 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 2026-10-12 14:58:17

www	93.191.156.141 (AS48854) (address records, no CNAME)
www vs bare domain	Same network optisyn.dk: 93.191.156.141 (AS48854) www.optisyn.dk: 93.191.156.141 (AS48854)
Wildcard	Yes: any name under the zone resolves
Denial of existence	NSEC zone can be walked (all names enumerable)
CDS / CDNSKEY	Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY

✍️ DKIM keys#

1 found

Selector	CNAME	Key
selector1	selector1-optisyn-dk._domainkey.optisyn.r-v1.dkim.mail.microsoft	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.

🔎 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#

210ms

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

🏷️ SOA#

98ms

Field	Value
Serial	2025121102
Primary NS (MNAME)	ns1.simply.com
Responsible (RNAME)	hostmaster@simply.com
Refresh	14400s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	3600s

📋 Registration#

WHOIS fetched 2026-10-03 03:51:44

Field	Value
Registrar	Simply.com A/S
Registered	2025-02-05
Expires	2027-02-04 (109d)

📋 WHOIS#

⏱️ Lookup Timing#

85ms

68ms

77ms

AAAA

67ms

TXT

148ms

CAA

78ms

HTTPS

67ms

TLSA

1310ms

SOA

98ms

MTA-STS

97ms

DNSSEC

210ms

SRV

0ms

Total

3053ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-12 14:58:17	1503ms	3 NS 1 A 1 MX	🔒 Secure
2026-10-09 10:52:49	1269ms	3 NS 1 A 1 MX	🔒 Secure
2026-10-03 03:32:13	1356ms	3 NS 1 A 1 MX	🔒 Secure
2026-09-28 02:31:49	2707ms	3 NS 1 A 1 MX	🔒 Secure
2026-09-20 05:43:40	1114ms	3 NS 1 A 1 MX	🔒 Secure
2026-08-27 15:03:37	1167ms	3 NS 1 A 1 MX	🔒 Secure
2026-08-26 00:12:12	789ms	3 NS 1 A 1 MX	🔒 Secure
2026-06-21 17:11:05	1770ms	3 NS 1 A 1 MX	🔒 Secure
2026-06-21 13:03:01	921ms	0 NS 0 A 0 MX	❓ Unknown
2026-06-17 12:59:03 shown	3053ms	3 NS 1 A 1 MX	🔒 Secure