holtze.dk is a .dk domain served by 2 nameservers (gail.ns.cloudflare.com, major.ns.cloudflare.com). It was registered on 3 December 1997 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Mail is handled by mail.clobix.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.
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 300s | mail.clobix.com | 5.186.44.132 | mail.clobix.com | AS44869 FIBIA P/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | mail.clobix.com → 5.186.44.132 |
| 🔶 Autoconfig | mail.clobix.com → 5.186.44.132 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 0 | 1 | 443 | mail.clobix.com |
| TXT Record |
|---|
| google-site-verification=PPuXwIyE066MtvTHnGltOBoHQ_SsHpmwI5JsoHMbLuw |
| v=spf1 a:mail.clobix.com -all |
| Policy | Record (holtze.dk) |
|---|---|
| -all (hard fail) | v=spf1 a:mail.clobix.com -all |
| Policy | Record (_dmarc.holtze.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; adkim=s; aspf=s; rua=mailto:dmarc@holtze.dk |
| www | Exists, no address |
| www vs bare domain | Neither resolves holtze.dk: no address www.holtze.dk: no address |
| Wildcard | No |
| Denial of existence | Compact NSEC (RFC 9824, "black lies") not walkable |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| dkim | — | 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: 1/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mail.clobix.com | DANE-EE · SPKI · SHA-256 | FE2D30076888ED3FF28B2FE874ACA4F9… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | resolution failed: ncache nxrrset |
| Field | Value |
|---|---|
| Serial | 2410524627 |
| Primary NS (MNAME) | gail.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 1997-12-03 |
| Expires | 2026-12-31 (70d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-07 14:45:39 | 655ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-10-01 10:49:29 | 880ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-30 10:46:54 | 506ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-29 19:46:50 | 600ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-23 11:25:46 | 719ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-10 20:05:26 | 3980ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-08-28 08:58:42 | 9505ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-08-14 18:11:43 | 7539ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-08-09 12:56:37 | 1450ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-07-27 01:39:08 shown | 10408ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-07-21 23:29:05 | 17426ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-07-02 16:10:29 | 1166ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-06-27 11:18:06 | 723ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-06-26 21:42:43 | 1512ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-06-26 11:17:03 | 1125ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-06-22 23:20:45 | 782ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-06-21 21:34:44 | 465ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-06-17 11:38:19 | 1010ms | 2 NS 0 A 1 MX | 🔒 Secure |