i-skole-nu.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 6 June 2012 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.21.42.54 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by .. 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 |
|---|---|---|---|---|---|---|---|
| 185.21.42.54 | 600s | — | AS48854 | team.blue Denmark A/S | 185.21.40.0/22 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 0 | 300s | . Null MX — domain accepts no email (RFC 7505) | |||
| www | 185.21.42.54 (AS48854) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC3 · 0 iterations · no salt RFC 9276 ✓ |
| 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 | 2026102201 |
| Primary NS (MNAME) | ns01.one.com |
| Responsible (RNAME) | hostmaster@one.com |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2012-06-06 |
| Expires | 2027-06-30 (247d) |
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 |
|---|---|---|---|
| 2026-10-22 18:26:27 shown | 969ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-09 03:29:11 | 624ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-10-07 18:56:24 | 541ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-09-24 03:13:12 | 831ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-08-21 18:21:08 | 5188ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-06-25 22:28:10 | 619ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-06-22 01:37:29 | 978ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-21 19:32:03 | 1087ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-17 22:25:04 | 884ms | 2 NS 1 A 4 MX | 🔒 Secure |