hydrabooks.dk is a .dk domain served by 3 nameservers (helium.ns.hetzner.de, hydrogen.ns.hetzner.com, oxygen.ns.hetzner.com). It was registered on 7 August 2019 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 91.100.105.193 is hosted by DKTV A/S (AS15516) in Denmark. Mail is handled by mail.nathue.dk, smtp.nathue.dk. 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 |
|---|---|---|---|---|---|---|---|
| 91.100.105.193 | 86400s | 91.100.105.193.generic-hostname.arrownet.dk | AS15516 | DKTV A/S | 91.100.0.0/15 | 🇩🇰 Denmark | Ballerup Municipality |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 86400s | mail.nathue.dk | 142.132.188.141 | mail.nathue.dk | AS24940 Hetzner Online GmbH |
| 15 | 86400s | smtp.nathue.dk | 142.132.188.141 | mail.nathue.dk | AS24940 Hetzner Online GmbH |
| TXT Record |
|---|
| v=spf1 mx ip4:142.132.188.141 ip4:80.71.130.71 ip4:77.33.126.180 -all |
| Policy | Record (hydrabooks.dk) |
|---|---|
| -all (hard fail) | v=spf1 mx ip4:142.132.188.141 ip4:80.71.130.71 ip4:77.33.126.180 -all |
| Policy | Record (_dmarc.hydrabooks.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine; pct=100; |
| www | 91.100.105.193 (AS15516) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
DNS lookups: 1/10 · 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 | 2026052601 |
| Primary NS (MNAME) | hydrogen.ns.hetzner.com |
| Responsible (RNAME) | dns@hetzner.com |
| Refresh | 86400s |
| Retry | 10800s |
| Expire | 3600000s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2019-08-07 |
| Expires | 2027-08-31 (317d) |
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).
No other domain with this registrant in our WHOIS data yet| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-30 22:20:29 | 856ms | 3 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-23 18:20:20 | 1053ms | 3 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-23 12:24:17 shown | 1009ms | 3 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-17 14:25:26 | 24085ms | 3 NS 1 A 2 MX | 🔓 Insecure |