sostershus.dk is a .dk domain served by 2 nameservers (ns1.curanet.dk, ns2.curanet.dk). It was registered on 20 February 2020 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.21.40.164 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by mail.sostershus.dk. 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 |
|---|---|---|---|---|---|---|---|
| 185.21.40.164 | 3600s | prolinux1.curanet.dk | AS48854 | team.blue Denmark A/S | 185.21.40.0/22 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 360s | mail.sostershus.dk | 162.55.134.177 | cp11.nordicway.dk | AS24940 Hetzner Online GmbH |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 185.21.40.164 |
| 🔶 Autoconfig | 185.21.40.164 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 10 | 10 | 443 | autodiscover.gigahost.dk |
| TXT Record |
|---|
| v=spf1 a mx include:spf.onlinemail.io include:relay.mailchannels.net -all |
| Policy | Record (sostershus.dk) |
|---|---|
| -all (hard fail) | v=spf1 a mx include:spf.onlinemail.io include:relay.mailchannels.net -all |
| Policy | Record (_dmarc.sostershus.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1;p=none;sp=none;adkim=r;aspf=r;pct=100;fo=0;rf=afrf;ri=86400 |
| www | 185.21.40.164 (AS48854) (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 |
|---|---|---|
| default | — | RSA Invalid key data — receivers can't verify signatures |
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: 6/10 · 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 | 2024100301 |
| 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 | 2020-02-20 |
| Expires | 2027-02-28 (124d) |
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).
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-25 07:56:45 shown | 515ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-27 19:51:38 | 1357ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-21 23:02:08 | 909ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-21 20:44:23 | 909ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-17 23:34:56 | 713ms | 2 NS 1 A 1 MX | 🔒 Secure |