hertzholm.dk is a .dk domain served by 2 nameservers (ns.dandomain.dk, ns2.dandomain.dk). It was registered on 30 July 2019 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 212.237.249.12 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by mx.spamfilter.io. The zone is DNSSEC-signed and validates, has no 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 |
|---|---|---|---|---|---|---|---|
| 212.237.249.12 | — | lb1.builder.nu | AS48854 | team.blue Denmark A/S | 212.237.248.0/23 | 🇩🇰 Denmark | — |
| TXT Record |
|---|
| v=spf1 include:spf.dandomain.dk -all |
| Policy | Record (hertzholm.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.dandomain.dk -all |
| www | 212.237.249.12 (AS48854) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
| Denial of existence | NSEC3 · 1 iteration · 1-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 3/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx.spamfilter.io | DANE-EE · SPKI · SHA-256 | 9A25F05F2E322DABDCC9B7A06AB47A2D… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2025100303 |
| Primary NS (MNAME) | ns.dandomain.dk |
| Responsible (RNAME) | hostmaster@dandomain.dk |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 300s |
| Field | Value |
|---|---|
| Registrar | DANDOMAIN A/S |
| Registered | 2019-07-30 |
| Expires | 2027-07-31 (280d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-30 05:31:16 | 345ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-08 19:55:37 | 563ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-28 03:42:25 | 691ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-02 23:22:26 | 9556ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-25 15:24:51 | 606ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-24 07:33:53 | 1090ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-22 18:10:29 | 979ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-19 18:45:42 | 2490ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 11:20:55 shown | 1037ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 11:19:05 | 889ms | 2 NS 1 A 1 MX | 🔒 Secure |