howtostudy.dk is a .dk domain served by 2 nameservers (ns.dandomain.dk, ns2.dandomain.dk). It was registered on 3 June 2021 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 93.191.158.41 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by mx1.dandomain.dk, mx2.dandomain.dk. The zone is DNSSEC-signed and validates, has no DMARC policy and has no IPv6 address. Below are all of its DNS records from our latest 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 |
|---|---|---|---|---|---|---|---|
| 93.191.158.41 | 3600s | linux21.dandomain.dk | AS48854 | team.blue Denmark A/S | 93.191.152.0/21 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | mx1.dandomain.dk | 212.237.249.50 | mx1.dandomain.dk | AS48854 team.blue Denmark A/S |
| 20 | 3600s | mx2.dandomain.dk | 46.36.209.11 | mx2.dandomain.dk | AS48854 team.blue Denmark A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover-mf.dandomain.dk → 212.237.249.98 |
| 🔶 Autoconfig | autoconfig-mf.dandomain.dk → 212.237.249.54 |
| www | 93.191.158.41 (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 |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2021062101 |
| 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 | 2021-06-03 |
| Expires | 2030-06-30 (1352d) |
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 |
|---|---|---|---|
| 2026-09-25 14:15:48 shown | 447ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-26 15:01:09 | 718ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-27 00:28:49 | 2655ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-23 22:35:18 | 1177ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-19 14:57:29 | 416ms | 2 NS 1 A 2 MX | ⚠️ Bogus |
| 2026-06-18 15:59:27 | 810ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-17 13:53:20 | 278ms | 0 NS 0 A 0 MX | ❓ Unknown |