seido-systems.dk is a .dk domain served by 3 nameservers (ns1.combell.eu, ns3.combell.net, ns4.combell.net). It was registered on 6 July 2026 (WHOIS) and first appeared in the .dk zone on 7 July 2026. Its website address 217.21.190.139 is hosted by Combell NV (AS34762) in Belgium. Mail is handled by mx.mailprotect.be, mx.backup.mailprotect.be. The zone is not DNSSEC-signed, 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 |
|---|---|---|---|---|---|---|---|
| 217.21.190.139 | 3600s | 217.21.190.139.static.hosted.by.combell.com | AS34762 | Combell NV | 217.21.176.0/20 | 🇧🇪 Belgium | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.mailprotect.be → 83.217.77.175 |
| 🔶 Autoconfig | autoconfig.mailprotect.be → 83.217.77.175 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 1 | 1 | 443 | autodiscover-s.mailprotect.be |
| _imaps._tcp | 1 | 1 | 993 | imap.mailprotect.be |
| TXT Record |
|---|
| v=spf1 mx a include:_spf.relay.mailprotect.be ~all |
| Policy | Record (seido-systems.dk) |
|---|---|
| ~all (soft fail) | v=spf1 mx a include:_spf.relay.mailprotect.be ~all |
| Policy | Record (_dmarc.seido-systems.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1;p=none; |
| www | 217.21.190.139 (AS34762) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
DNS lookups: 4/10 · policy: ~all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 1759303306 |
| Primary NS (MNAME) | ns1.combell.eu |
| Responsible (RNAME) | hostmaster@seido-systems.dk |
| Refresh | 10800s |
| Retry | 3600s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 40000s |
| Field | Value |
|---|---|
| Registrar | 1API GmbH |
| Registered | 2026-07-06 |
| Expires | 2027-07-05 (251d) |
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 |
|---|---|---|---|
| 2026-10-09 09:29:24 | 670ms | 3 NS 1 A 2 MX | 🔓 Insecure |
| 2026-10-01 03:41:04 | 788ms | 3 NS 1 A 2 MX | 🔓 Insecure |
| 2026-08-05 06:17:01 shown | 1717ms | 3 NS 1 A 2 MX | 🔓 Insecure |
| 2026-07-28 13:03:41 | 986ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-07-27 11:59:56 | 665ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-07-26 11:31:09 | 2683ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-07-25 11:28:13 | 747ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-07-24 11:04:13 | 9731ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-07-23 10:14:09 | 579ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-07-22 04:09:57 | 611ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-07-21 01:47:44 | 601ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-07-19 15:07:42 | 560ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-07-18 13:39:35 | 589ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-07-17 11:30:05 | 820ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-07-16 10:38:11 | 2693ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-07-14 08:32:36 | 8529ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-07-08 14:21:46 | 8678ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-07-07 08:54:38 | 1426ms | 1 NS 0 A 0 MX | ❓ Unknown |