fertan.dk is a .dk domain served by 3 nameservers (ns1.linuxhus.dk, ns2.linuxhus.dk, ns3.linuxhus.dk). It was registered on 13 February 2016 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 37.128.222.21 is hosted by Sinal A/S (AS39642) in Denmark. Mail is handled by mx.mailsec.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.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns1.linuxhus.dk | 37.128.222.18 | — | AS39642 Sinal A/S |
| ns2.linuxhus.dk | 37.128.222.19 | — | AS39642 Sinal A/S |
| ns3.linuxhus.dk | 37.128.222.20 | — | AS39642 Sinal A/S |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 37.128.222.21 | 3600s | — | AS39642 | Sinal A/S | 37.128.208.0/20 | 🇩🇰 Denmark | Esbjerg |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 5 | 3600s | mx.mailsec.dk | 37.128.222.5 | mx.mailsec.dk | AS39642 Sinal A/S |
| TXT Record |
|---|
| v=spf1 a mx a:fertan.dk ip4:37.128.222.21 ip4:37.128.222.21 ?all |
| Policy | Record (fertan.dk) |
|---|---|
| ?all (neutral) | v=spf1 a mx a:fertan.dk ip4:37.128.222.21 ip4:37.128.222.21 ?all |
| Policy | Record (_dmarc.fertan.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine; pct=100; adkim=r; aspf=r |
| Flags | Tag | Value |
|---|---|---|
| 0 | issuewild | letsencrypt.org |
| www | 37.128.222.21 (AS39642) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC3 · 0 iterations · no salt RFC 9276 ✓ |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 3/10 · policy: ?all
| Service / Owner | Type | Cert association |
|---|---|---|
| HTTPS _443._tcp.fertan.dk | DANE-EE · Full cert · SHA-256 | 0BD1FB89EA004948EE2CC5FAD79D5D5C… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026100700 |
| Primary NS (MNAME) | ns1.linuxhus.dk |
| Responsible (RNAME) | root@ns1.linuxhus.dk |
| Refresh | 3600s |
| Retry | 600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2016-02-13 |
| Expires | 2027-02-28 (133d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-07 18:53:01 shown | 2553ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-02 18:00:16 | 854ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-30 17:50:11 | 607ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-24 14:45:56 | 912ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-19 15:10:22 | 2174ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-10 21:30:29 | 1196ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-24 21:44:56 | 4077ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-20 19:06:11 | 12979ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-13 14:00:58 | 5509ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-03 05:44:23 | 1565ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-26 17:36:11 | 672ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-19 22:16:44 | 4625ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-17 05:22:17 | 22708ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-13 03:01:14 | 17927ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-04 13:51:33 | 5425ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-28 02:55:21 | 816ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-26 15:59:11 | 2766ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 10:14:03 | 2957ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 10:08:06 | 1081ms | 3 NS 1 A 1 MX | 🔒 Secure |