oxygen.dk

📜 Historical scan 2026-08-09 23:58:49 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

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.

🖥️ Nameservers#

2 records 117ms

Nameserver	IP addresses	PTR	ASN / ISP
ns1.curanet.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.curanet.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 111ms

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

📧 MX Records#

1 records 135ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	3600s	oxygen-dk.mail.protection.outlook.com	2a01:111:f403:ca04::10 2a01:111:f403:ca04::b 2a01:111:f403:ca09:: 2a01:111:f403:ca09::9 52.101.68.10 52.101.68.3 52.101.73.1 52.101.73.28	mail-dbapr03cu00100.inbound.protection.outlook.com mail-dbbpr03cu00103.inbound.protection.outlook.com mail-am3pr04cu00500.inbound.protection.outlook.com mail-as8pr04cu00801.inbound.protection.outlook.com mail-dbbpr03cu00102.inbound.protection.outlook.com mail-db7pr03cu00403.inbound.protection.outlook.com mail-am3pr04cu00501.inbound.protection.outlook.com mail-am7pr05cu00204.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 → 40.104.116.56
🔶 Autoconfig	185.21.41.117

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records#

1 records 241ms

Service	Priority	Weight	Port	Target
_sipfederationtls._tcp	100	1	5061	sipfed.online.lync.com

📝 TXT Records#

5 records 334ms

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

✉️ SPF#

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

📨 DMARC#

Policy	Record (_dmarc.oxygen.dk)
p=reject	v=DMARC1; p=reject; rua=mailto:mp@oxygen.dk

📬 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 2026-10-07 22:59:21

www CNAME	oxygen-oxygendk-frontend-prod.azurewebsites.net (all on azurewebsites.net) → 20.105.216.31 (AS8075)
www vs bare domain	Same network oxygen.dk: 20.105.216.31 (AS8075) www.oxygen.dk: 20.105.216.31 (AS8075)
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#

3 found

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.

🔎 SPF check#

zone-wide SPF report

DNS lookups: 5/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

183ms

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

🏷️ SOA#

0ms

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

📋 Registration#

WHOIS fetched 2026-10-07 22:20:23

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	1997-12-19
Expires	2026-12-31 (73d)

📋 WHOIS#

⏱️ Lookup Timing#

117ms

111ms

135ms

AAAA

128ms

TXT

334ms

CAA

131ms

HTTPS

133ms

TLSA

200ms

SOA

0ms

MTA-STS

149ms

DNSSEC

183ms

SRV

241ms

Total

1472ms

🕐 Scan History#

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	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 shown	1472ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-17 15:17:15	827ms	2 NS 1 A 1 MX	🔒 Secure