4os.dk is a .dk domain served by 2 nameservers (ns1.curanet.dk, ns2.curanet.dk). It was registered on 19 March 2009 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 95.166.113.35 is hosted by TDC Holding A/S (AS3292) in Denmark. Mail is handled by 4os-dk.mail.protection.outlook.com. The zone is DNSSEC-signed and validates, has no 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 95.166.113.35 | 3600s | — | AS3292 | TDC Holding A/S | 95.166.64.0/18 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | 4os-dk.mail.protection.outlook.com | — | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 52.98.149.136 |
| 🔶 Autoconfig | 93.191.155.37 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 100 | 1 | 443 | remote.4os.dk |
| _sipfederationtls._tcp | 100 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| _globalsign-domain-verification=xxTTxdBZBDdcmwf1Vq1WUXd2zOngTJkHnTmXMmoVKx |
| MS=ms99155619 |
| v=spf1 include:spf.protection.outlook.com -all |
| Policy | Record (4os.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com -all |
| www | 93.191.155.37 (AS48854) (address records, no CNAME) |
| www vs bare domain | Different networks (all like this) |
| 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 |
DNS lookups: 1/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2021111701 |
| Primary NS (MNAME) | ns1.curanet.dk |
| Responsible (RNAME) | hostmaster@curanet.dk |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 300s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2009-03-19 |
| Expires | 2027-03-31 (161d) |
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).
No other domain with this registrant in our WHOIS data yet| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-30 15:59:13 shown | 656ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-24 22:17:17 | 551ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-27 23:51:25 | 1420ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-24 10:21:31 | 957ms | 2 NS 1 A 1 MX | ⚠️ Bogus |
| 2026-06-22 05:57:38 | 1684ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-20 00:52:00 | 881ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-16 13:14:22 | 1673ms | 2 NS 1 A 1 MX | 🔒 Secure |