hdbook.dk is a .dk domain served by 2 nameservers (dns1.cscdns.net, dns2.cscdns.net). It was registered on 15 May 2013 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 212.53.89.138 is hosted by Aptum Technologies (AS13768) in United Kingdom. Mail is handled by relay1.netnames.net, relay2.netnames.net. 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 |
|---|---|---|---|---|---|---|---|
| 212.53.89.138 | 86400s | redirector.netnames.net | AS13768 | Aptum Technologies | 212.53.64.0/19 | 🇬🇧 United Kingdom | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 86400s | relay1.netnames.net | 185.26.230.83 | relay1.netnames.net | — |
| 20 | 86400s | relay2.netnames.net | 185.26.230.89 | relay2.netnames.net | — |
| TXT Record |
|---|
| v=spf1 -all |
| Policy | Record (hdbook.dk) |
|---|---|
| -all (hard fail) | v=spf1 -all |
| Policy | Record (_dmarc.hdbook.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:1559aaadaeb7147@rep.dmarcanalyzer.com; adkim=s; aspf=s; |
| www | 212.53.89.138 (AS13768) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
DNS lookups: 0/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2018073007 |
| Primary NS (MNAME) | dns1.cscdns.net |
| Responsible (RNAME) | hostmaster@cscdns.net |
| Refresh | 10800s |
| Retry | 1800s |
| Expire | 3600000s |
| Minimum (neg-cache TTL) | 86400s |
| Field | Value |
|---|---|
| Registrar | CSC Digital Brand Service, Inc |
| Registered | 2013-05-15 |
| Expires | 2027-05-31 (225d) |
Other .dk domains whose WHOIS registrant has the same name and postal address. Matched on a keyed hash: the registrant's details are not stored or shown. Covers only domains whose WHOIS we have fetched (refreshed about monthly).
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-01 00:56:56 | 688ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-09-30 02:23:10 | 614ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-07-19 11:00:29 | 16894ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-26 18:32:13 | 691ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-23 07:20:53 shown | 1425ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-21 13:26:03 | 924ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-20 21:35:44 | 557ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-19 23:15:43 | 2477ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-17 10:50:53 | 520ms | 2 NS 1 A 2 MX | 🔓 Insecure |