sat4u.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 8 November 2007 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 5.186.54.156 is hosted by FIBIA P/S (AS44869) in Denmark. Mail is handled by mail.sat4u.dk. The zone is not DNSSEC-signed, 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 |
|---|---|---|---|---|---|---|---|
| 5.186.54.156 | 3600s | 5.186.54.156.static.fibianet.dk | AS44869 | FIBIA P/S | 5.186.0.0/16 | 🇩🇰 Denmark | Egå |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | mail.sat4u.dk | 193.200.90.180 | web8.e-studio.dk | AS62121 Christian Ebsen ApS |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 193.200.90.180 |
| 🔶 Autoconfig | 193.200.90.180 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 0 | 0 | 443 | cpanelemaildiscovery.cpanel.net |
| TXT Record |
|---|
| v=spf1 +a +mx +ip4:193.200.90.180 include:_spf.e-studio.dk ~all |
| Policy | Record (sat4u.dk) |
|---|---|
| ~all (soft fail) | v=spf1 +a +mx +ip4:193.200.90.180 include:_spf.e-studio.dk ~all |
| Policy | Record (_dmarc.sat4u.dk) |
|---|---|
| p=reject | v=DMARC1;p=reject; adkim=s; aspf=s |
| www | 5.186.54.156 (AS44869) (address records, no CNAME) |
| 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.sat4u.dk | FIW2yUyX4rkeZh_eiKna_1YUSkRPcHEOd33YfHIdHSM |
| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✓ Found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2026072403 |
| 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 | 2007-11-08 |
| Expires | 2026-11-30 (34d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-08 14:48:33 | 447ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-27 00:04:34 | 872ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-24 21:39:43 | 573ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-23 20:15:09 | 1631ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-13 12:02:13 | 719ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-08 21:39:23 | 467ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-26 12:54:30 shown | 615ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-07-24 21:55:30 | 9633ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-28 00:27:25 | 1190ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-17 11:45:53 | 668ms | 3 NS 1 A 1 MX | 🔓 Insecure |