oxygen.dk is a .dk domain served by 2 nameservers (ns1.curanet.dk, ns2.curanet.dk). It was registered on 19 December 1997 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 20.105.216.31 is hosted by Microsoft Corporation (AS8075) in The Netherlands. Mail is handled by oxygen-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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 20.105.216.31 | 3600s | — | AS8075 | Microsoft Corporation | 20.64.0.0/10 | 🇳🇱 The Netherlands | Amsterdam |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 40.104.116.8 |
| 🔶 Autoconfig | 185.21.41.117 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _sipfederationtls._tcp | 100 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| 1password-site-verification=FR4EPTUI7RHJ3NMCGN7RO5532Y |
| google-site-verification=cV0LVVUnT_ky72DG05-RyqhOlOTPm6hYempNA0eimA0 |
| MS=ms11535171 |
| v=spf1 ip4:94.231.106.100 ip4:93.160.59.162 ip4:94.231.109.40 ip4:94.231.109.69 ip4:93.160.59.162 ip4:94.231.108.223 ip4:93.167.245.22 include:spf.protection.outlook.com include:spf.mandrillapp.com include:spf.curanet.dk -all |
| WB=BBy56YqHM0eYqQdd1tO5CQ |
| Policy | Record (oxygen.dk) |
|---|---|
| -all (hard fail) | v=spf1 ip4:94.231.106.100 ip4:93.160.59.162 ip4:94.231.109.40 ip4:94.231.109.69 ip4:93.160.59.162 ip4:94.231.108.223 ip4:93.167.245.22 include:spf.protection.outlook.com include:spf.mandrillapp.com include:spf.curanet.dk -all |
| Policy | Record (_dmarc.oxygen.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:mp@oxygen.dk |
| www CNAME | oxygen-oxygendk-frontend-prod.azurewebsites.net (all on azurewebsites.net) → 20.105.216.31 (AS8075) |
| 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.u34557181.wl182.sendgrid.net | RSA · ~2048 bit |
| s2 | s2.domainkey.u34557181.wl182.sendgrid.net | RSA · ~2048 bit |
| selector2 | selector2-oxygen-dk._domainkey.oxygenoffice.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.
DNS lookups: 5/10 · 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 | 2026080602 |
| 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 | 1997-12-19 |
| Expires | 2026-12-31 (73d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-07 22:59:21 | 1161ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-30 16:22:46 | 1034ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-24 17:18:55 | 1269ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-04 04:13:43 | 1324ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-27 15:07:57 shown | 1267ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-26 23:35:46 | 1002ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-09 23:58:49 | 1472ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 15:17:15 | 827ms | 2 NS 1 A 1 MX | 🔒 Secure |