rudehmsen.dk is a .dk domain served by 3 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com). It was registered on 25 January 2007 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 5.186.78.19 is hosted by FIBIA P/S (AS44869) in Denmark. Mail is handled by mx01.kolabnow.com, mx02.kolabnow.com 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 |
|---|---|---|---|---|---|---|---|
| 5.186.78.19 | 3600s | 5.186.78.19.dhcp.fibianet.dk | AS44869 | FIBIA P/S | 5.186.0.0/16 | 🇩🇰 Denmark | Odense |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | apps.kolabnow.com → 185.254.79.30 |
| 🔶 Autoconfig | 5.186.78.19 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 0 | 0 | 443 | apps.kolabnow.com |
| _imap._tcp | 0 | 0 | 143 | imap.kolabnow.com |
| _imaps._tcp | 0 | 1 | 993 | imap.kolabnow.com |
| TXT Record |
|---|
| v=spf1 mx -all |
| Policy | Record (rudehmsen.dk) |
|---|---|
| -all (hard fail) | v=spf1 mx -all |
| Policy | Record (_dmarc.rudehmsen.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; adkim=r; aspf=r; rua=mailto:j8p0lrwt@ag.eu.dmarcian.com; ruf=mailto:martin@ehmsen.org |
| www | 5.186.78.19 (AS44869) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
| 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 |
DNS lookups: 1/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx01.kolabnow.com | DANE-EE · Full cert · SHA-256 | 41B01929AFEBCF769577C1B3B9D41F0B… |
| SMTP _25._tcp.mx01.kolabnow.com | DANE-EE · Full cert · SHA-256 | C48641B0A3AA38C42B6C5BFD42A25D63… |
| SMTP _25._tcp.mx02.kolabnow.com | DANE-EE · Full cert · SHA-256 | 41B01929AFEBCF769577C1B3B9D41F0B… |
| SMTP _25._tcp.mx02.kolabnow.com | DANE-EE · Full cert · SHA-256 | C48641B0A3AA38C42B6C5BFD42A25D63… |
| SMTP _25._tcp.mx03.kolabnow.com | DANE-EE · Full cert · SHA-256 | C48641B0A3AA38C42B6C5BFD42A25D63… |
| SMTP _25._tcp.mx03.kolabnow.com | DANE-EE · Full cert · SHA-256 | 41B01929AFEBCF769577C1B3B9D41F0B… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026061601 |
| 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 | 2007-01-25 |
| Expires | 2027-01-31 (99d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-04 09:50:57 | 1246ms | 3 NS 1 A 3 MX | 🔒 Secure |
| 2026-09-30 09:42:32 | 844ms | 3 NS 1 A 3 MX | 🔒 Secure |
| 2026-09-25 01:07:33 | 1196ms | 3 NS 1 A 3 MX | 🔒 Secure |
| 2026-09-16 21:23:50 | 1086ms | 3 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-20 06:08:09 | 1719ms | 3 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-20 04:40:54 shown | 1770ms | 3 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-17 14:41:39 | 3451ms | 3 NS 1 A 3 MX | 🔒 Secure |