nxdomain.dk is a .dk domain served by 3 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com). It was registered on 16 December 2022 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Mail is handled by mailrelay.nxdomain.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.
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | — | mailrelay.nxdomain.dk | 212.178.179.169 | mailrelay.nxdomain.dk | AS44869 FIBIA P/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | orion.nxdomain.dk → 212.178.179.163 |
| 🔶 Autoconfig | orion.nxdomain.dk → 212.178.179.163 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 0 | 1 | 443 | orion.nxdomain.dk |
| _imaps._tcp | 0 | 1 | 993 | orion.nxdomain.dk |
| TXT Record |
|---|
| v=spf1 ip4:212.178.179.160/28 -all |
| Policy | Record (nxdomain.dk) |
|---|---|
| -all (hard fail) | v=spf1 ip4:212.178.179.160/28 -all |
| Policy | Record (_dmarc.nxdomain.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:dkim-postmaster@nxdomain.dk |
| Check | Result |
|---|---|
| Status | 🔒 Enforce |
| TXT record (_mta-sts) | ✓ Found |
| HTTPS policy | ✓ Valid |
| Mode | enforce |
| Policy ID | 2023062101 |
| max_age | 604800s |
| Policy MX | mailrelay.nxdomain.dk |
| Status | Report address (rua) |
|---|---|
| ✓ Enabled | mailto:smtptlsreport@nxdomain.dk |
| www | NXDOMAIN |
| www vs bare domain | Neither resolves nxdomain.dk: no address www.nxdomain.dk: no address |
| 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 |
|---|---|---|
| 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: 0/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mailrelay.nxdomain.dk | DANE-EE · SPKI · SHA-256 | 27D4636990473032011C569D5D0A0038… |
| SMTP _25._tcp.mailrelay.nxdomain.dk | DANE-EE · SPKI · SHA-256 | 9A7188551AD40031CA7B6F426D5CB93C… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | resolution failed: ncache nxrrset |
| Field | Value |
|---|---|
| Serial | 2026032500 |
| Primary NS (MNAME) | ns1.simply.com |
| Responsible (RNAME) | hostmaster@simply.com |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Simply.com A/S |
| Registered | 2022-12-16 |
| Expires | 2026-12-15 (52d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-21 21:30:13 | 592ms | 3 NS 0 A 1 MX | 🔒 Secure |
| 2026-10-13 04:47:14 | 1300ms | 3 NS 0 A 1 MX | 🔒 Secure |
| 2026-10-02 05:33:14 | 859ms | 3 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-30 05:16:45 | 521ms | 3 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-18 21:03:04 | 815ms | 3 NS 0 A 1 MX | 🔒 Secure |
| 2026-08-27 04:16:38 | 689ms | 3 NS 0 A 1 MX | 🔒 Secure |
| 2026-06-25 14:09:19 | 827ms | 3 NS 0 A 1 MX | 🔒 Secure |
| 2026-06-24 07:26:21 | 3421ms | 3 NS 0 A 1 MX | 🔒 Secure |
| 2026-06-22 07:10:44 | 984ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-20 09:56:36 | 702ms | 3 NS 0 A 1 MX | 🔒 Secure |
| 2026-06-17 23:05:49 shown | 712ms | 3 NS 0 A 1 MX | 🔒 Secure |