jost.dk is a .dk domain served by 3 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 91.226.144.216 is hosted by Netnoerden ApS (AS216275) in Denmark. Mail is handled by mail.jost.dk, mx2.jost.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 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 |
|---|---|---|---|---|---|---|---|
| 91.226.144.216 | 600s | — | AS216275 | Netnoerden ApS | 91.226.144.0/23 | 🇩🇰 Denmark | Frederiksberg |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 600s | mail.jost.dk | 91.226.144.216 | — | AS216275 Netnoerden ApS |
| 15 | 600s | mx2.jost.dk | 185.139.228.78 | — | AS36007 Kamatera, Inc. |
| TXT Record |
|---|
| google-site-verification=FfcFGfNeGmBBOMVUN4f-z0G5XhOClEeXNOCMQXM0xNM |
| v=spf1 ip4:80.167.254.38 ip4:91.226.144.216 ip4:185.139.228.78 include:spf.smtp2go.com -all |
| Policy | Record (jost.dk) |
|---|---|
| -all (hard fail) | v=spf1 ip4:80.167.254.38 ip4:91.226.144.216 ip4:185.139.228.78 include:spf.smtp2go.com -all |
| Policy | Record (_dmarc.jost.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:1ys2gnwa@ag.dmarcian-eu.com |
| www | 91.226.144.216 (AS216275) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC zone can be walked (all names enumerable) |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| default | — | 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.
DNS lookups: 1/10 · 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 | 2025031700 |
| Primary NS (MNAME) | ns1.simply.com |
| Responsible (RNAME) | hostmaster@simply.com |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 3600s |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-12 21:18:16 | 2277ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-10-02 09:03:03 | 752ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-23 18:51:31 | 929ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-03 11:47:03 | 2941ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-01 13:52:05 | 819ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-01 00:31:24 | 745ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-21 14:28:32 | 6141ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-20 14:20:18 | 6258ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-02 06:08:34 | 717ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-24 21:59:15 shown | 5593ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-21 02:32:57 | 870ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-20 16:00:31 | 1371ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-17 12:11:16 | 982ms | 3 NS 1 A 2 MX | 🔒 Secure |