filtertek.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 18 August 2005 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.21.41.178 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by mx01.hornetsecurity.com, mx02.hornetsecurity.com and 2 more. The zone is DNSSEC-signed and validates, has no 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 |
|---|---|---|---|---|---|---|---|
| 185.21.41.178 | 3600s | linux19.curanet.dk | AS48854 | team.blue Denmark A/S | 185.21.40.0/22 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 43200s | mx01.hornetsecurity.com | 94.100.132.8 | mx01.hornetsecurity.com | AS25394 MK Netzdienste GmbH & Co. KG |
| 20 | 43200s | mx02.hornetsecurity.com | 94.100.136.8 | mx02.hornetsecurity.com | AS24679 kyberio GmbH |
| 30 | 43200s | mx03.hornetsecurity.com | 94.100.134.8 | mx03.hornetsecurity.com | AS12676 HKN GmbH |
| 40 | 43200s | mx04.hornetsecurity.com | 94.100.136.7 | mx04.hornetsecurity.com | AS24679 kyberio GmbH |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscoverredirect.sfp-net.com → 212.53.208.152 |
| 🔶 Autoconfig | 185.21.41.178 |
| TXT Record |
|---|
| v=spf1 a mx include:spf.sfp-net.com ~all |
| v=spf1 include:spf.curanet.dk |
| v=spf1 include:spf.magepartner.net mx ip4:83.246.65.0/24 ip4:217.64.175.0/24 ip4:94.100.128.0/20 ~all |
| Policy | Record (filtertek.dk) |
|---|---|
| ~all (soft fail) | v=spf1 a mx include:spf.sfp-net.com ~all |
| no all — incomplete SPF | v=spf1 include:spf.curanet.dk |
| ~all (soft fail) | v=spf1 include:spf.magepartner.net mx ip4:83.246.65.0/24 ip4:217.64.175.0/24 ip4:94.100.128.0/20 ~all |
| www | 185.21.41.178 (AS48854) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| dkim | — | 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: 3/10 · policy: ~all
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026101101 |
| Primary NS (MNAME) | ns01.one.com |
| Responsible (RNAME) | hostmaster@one.com |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2005-08-18 |
| Expires | 2027-08-31 (318d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-12 03:02:34 shown | 2564ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-10-06 13:12:07 | 440ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-09-28 10:47:34 | 1529ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-09-27 04:45:14 | 563ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-09-24 06:15:51 | 635ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-09-05 11:33:22 | 586ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-08-25 13:02:08 | 4807ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-08-19 18:21:32 | 1930ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-08-18 18:18:23 | 3286ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-06-23 16:44:07 | 702ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-06-20 06:17:49 | 797ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-06-17 09:48:46 | 792ms | 2 NS 1 A 4 MX | 🔒 Secure |