koelbak.dk is a .dk domain served by 4 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com and 1 more). It was registered on 22 May 2006 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 178.157.248.48 is hosted by Sinal A/S (AS39642) in Denmark. Mail is handled by mx.simply.com. 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 |
|---|---|---|---|---|---|---|---|
| 178.157.248.48 | 3600s | — | AS39642 | Sinal A/S | 178.157.192.0/18 | 🇩🇰 Denmark | Silkeborg |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 2601s | mx.simply.com | 94.231.106.20 | mx.simply.com | AS48854 team.blue Denmark A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | koelbak.dk → 178.157.248.48 |
| 🔶 Autoconfig | koelbak.dk → 178.157.248.48 |
| TXT Record |
|---|
| v=spf1 include:spf.simply.com -all |
| Policy | Record (koelbak.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.simply.com -all |
| Policy | Record (_dmarc.koelbak.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:dmarc@robot.simply.com; ruf=mailto:dmarc@robot.simply.com; |
| www | 178.157.248.48 (AS39642) (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| Type | Name | Value |
|---|---|---|
| CNAME | _acme-challenge.koelbak.dk | koelbak.dk |
| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx.simply.com | DANE-EE · SPKI · SHA-256 | A9D603AF4D7ED6B9246B4B68500CD6F2… |
| SMTP _25._tcp.mx.simply.com | DANE-EE · SPKI · SHA-256 | 97A3BA009F39C761BFFB6574340E8138… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2025042300 |
| 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 | 2006-05-22 |
| Expires | 2032-05-31 (2045d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-02 00:39:27 | 927ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-25 23:29:50 shown | 2492ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-27 23:16:10 | 724ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-27 09:06:52 | 733ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-18 05:29:49 | 22887ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-18 03:06:46 | 38866ms | 4 NS 1 A 1 MX | 🔒 Secure |