cnu.dk is a .dk domain served by 3 nameservers (ns1.e-studio.dk, ns2.e-studio.dk, ns3.e-studio.dk). It was registered on 26 February 2001 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 193.200.90.178 is hosted by Christian Ebsen ApS (AS62121) in Denmark. Mail is handled by mx1.spamfri.dk, mx2.spamfri.dk and 1 more. 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 |
|---|---|---|---|---|---|---|---|
| 193.200.90.178 | 14400s | web6.e-studio.dk | AS62121 | Christian Ebsen ApS | 193.200.90.0/23 | 🇩🇰 Denmark | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 193.200.90.178 |
| 🔶 Autoconfig | 193.200.90.178 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 0 | 0 | 443 | cpanelemaildiscovery.cpanel.net |
| TXT Record |
|---|
| v=spf1 +a +mx +ip4:193.200.90.178 include:_spf.e-studio.dk ~all |
| Policy | Record (cnu.dk) |
|---|---|
| ~all (soft fail) | v=spf1 +a +mx +ip4:193.200.90.178 include:_spf.e-studio.dk ~all |
| Policy | Record (_dmarc.cnu.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; |
| www CNAME | cnu.dk (all on cnu.dk) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC3 · 7 iterations · 8-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| default | — | RSA · ~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: 3/10 · policy: ~all
No problems found| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.cnu.dk | oINe7AySQEDmo2Eu56oW_sGlmUKG5r0RXz7ULxTrWVA |
| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx1.spamfri.dk | DANE-EE · SPKI · SHA-256 | 884451547A03D0AC2F628D943839BAA6… |
| SMTP _25._tcp.mx2.spamfri.dk | DANE-EE · SPKI · SHA-256 | 6598C93F79B95376BB8099E9AC862167… |
| SMTP _25._tcp.mx3.spamfri.dk | DANE-EE · SPKI · SHA-256 | BBFB0694919290E5BC9D6E2C6F47D846… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026081001 |
| Primary NS (MNAME) | ns1.e-studio.dk |
| Responsible (RNAME) | hostmaster@mailrelay.e-studio.dk |
| Refresh | 3600s |
| Retry | 1800s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 86400s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2001-02-26 |
| Expires | 2036-03-31 (3453d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-13 00:17:15 | 818ms | 3 NS 1 A 3 MX | 🔒 Secure |
| 2026-10-11 22:15:01 | 1839ms | 3 NS 1 A 3 MX | 🔒 Secure |
| 2026-10-10 21:16:20 | 2387ms | 3 NS 1 A 3 MX | 🔒 Secure |
| 2026-09-07 00:05:15 shown | 608ms | 3 NS 1 A 3 MX | 🔒 Secure |
| 2026-08-10 16:26:14 | 4256ms | 3 NS 1 A 3 MX | 🔒 Secure |
| 2026-07-02 23:03:06 | 733ms | 3 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-25 05:01:14 | 636ms | 3 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-23 23:10:11 | 1177ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-16 22:01:09 | 65535ms | 3 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-16 21:53:31 | 2052ms | 3 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-16 21:30:21 | 2611ms | 3 NS 1 A 3 MX | 🔒 Secure |