duos.dk is a .dk domain served by 2 nameservers (ns.scannet2.dk, ns2.scannet2.dk). It was registered on 8 August 2016 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 87.116.13.122 is hosted by GlobalConnect A/S (AS31027) in Denmark. Mail is handled by mx1-dk.centerasecurity.dk, mx2-dk.centerasecurity.dk and 1 more. The zone is DNSSEC-signed and validates, publishes a 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 |
|---|---|---|---|---|---|---|---|
| 87.116.13.122 | 600s | s6.stom.dk | AS31027 | GlobalConnect A/S | 87.116.0.0/18 | 🇩🇰 Denmark | Copenhagen |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 40.104.116.24 |
| 🔶 Autoconfig | duos.dk → 87.116.13.122 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _sipfederationtls._tcp | 100 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| apple-domain-verification=UixNMtD5hvfLc0J1 |
| docusign=849519c6-3094-4302-8e00-a61049335bd2 |
| MS=ms82996542 |
| pardot1062442=404507a121f3b90609a1f682c19ec3e1cfc532b4e742e283dc859fe738336c2d |
| sending_domain1062442=36afd0289a439331f3ebc527514fbbef3b3704057ad18f1df312a97e648741e5 |
| teamviewer-sso-verification=54e0d38f1c7e48fbbdda36508c55d3ce |
| v=spf1 include:_spf73220.spf-protect.dk -all |
| Policy | Record (duos.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf73220.spf-protect.dk -all |
| Policy | Record (_dmarc.duos.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:685bf46bcddb0@dmarc-dk.centerasecurity.com; ruf=mailto:tdj@duos.dk |
| www | 87.116.13.122 (AS31027) (address records, no CNAME) |
| www vs bare domain | Same network |
| 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 |
| Selector | CNAME | Key |
|---|---|---|
| s1 | s1.domainkey.u37673289.wl040.sendgrid.net | RSA · ~2048 bit |
| s2 | s2.domainkey.u37673289.wl040.sendgrid.net | 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.
DNS lookups: 5/10 · policy: -all
No problems found| Type | Name | Value |
|---|---|---|
| CNAME | _acme-challenge.duos.dk | duos.dk |
| TXT | duos.dk | apple-domain-verification=UixNMtD5hvfLc0J1 |
| TXT | duos.dk | docusign=849519c6-3094-4302-8e00-a61049335bd2 |
| TXT | duos.dk | teamviewer-sso-verification=54e0d38f1c7e48fbbdda36508c55d3ce |
| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx1-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | D4C349E7B72F5CF4A9CEA358F98947C2… |
| SMTP _25._tcp.mx1-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | 56315B43B892E9AEE184919EC6A5821C… |
| SMTP _25._tcp.mx2-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | 56315B43B892E9AEE184919EC6A5821C… |
| SMTP _25._tcp.mx2-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | D4C349E7B72F5CF4A9CEA358F98947C2… |
| SMTP _25._tcp.mx3-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | 56315B43B892E9AEE184919EC6A5821C… |
| SMTP _25._tcp.mx3-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | D4C349E7B72F5CF4A9CEA358F98947C2… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026091602 |
| Primary NS (MNAME) | ns.scannet2.dk |
| Responsible (RNAME) | hostmaster@scannet.dk |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 300s |
| Field | Value |
|---|---|
| Registrar | A/S SCANNET |
| Registered | 2016-08-08 |
| Expires | 2027-08-31 (317d) |
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 |
|---|---|
| duos-bpa.dk | Punktum dk A/S (direct) |
| duos-vikar.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-25 18:36:40 shown | 645ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-09-18 20:18:07 | 1245ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-09-10 14:43:48 | 671ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-09-03 16:21:32 | 699ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-23 08:33:07 | 1104ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-21 05:59:41 | 1166ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-19 23:36:00 | 1382ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-17 05:09:41 | 29525ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-17 05:06:17 | 758ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-17 05:03:47 | 3246ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-17 05:00:58 | 2947ms | 2 NS 1 A 3 MX | 🔒 Secure |