crystal-fibre.dk is a .dk domain served by 2 nameservers (a.portsdns.se, b.portsdns.net). It was registered on 3 February 2000 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 213.237.89.88 is hosted by Telenor A/S (AS9158) in Denmark. Mail is handled by crystal-fibre.dk. The zone is not DNSSEC-signed, 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 |
|---|---|---|---|---|---|---|---|
| 213.237.89.88 | 3600s | — | AS9158 | Telenor A/S | 213.237.0.0/17 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | crystal-fibre.dk | 213.237.89.88 | — | AS9158 Telenor A/S |
| www CNAME | guld00.cybercity.dk (all on cybercity.dk) ⚠ Dangling: the CNAME target does not exist. If that name can be claimed (an unregistered domain, or a free name on a hosting platform), whoever claims it controls www.crystal-fibre.dk |
| www vs bare domain | www does not resolve (all like this) |
| Wildcard | No |
| 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 | 2023101701 |
| Primary NS (MNAME) | a.portsdns.se |
| Responsible (RNAME) | registry@ports.net |
| Refresh | 10800s |
| Retry | 3600s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Abion AB |
| Registered | 2000-02-03 |
| Expires | 2027-03-31 (158d) |
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).
| Domain | Registrar |
|---|---|
| nktresearch.dk | Abion AB |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-23 22:29:39 shown | 582ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-27 20:13:41 | 935ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-26 10:14:06 | 2350ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-25 19:14:46 | 3203ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-20 22:48:31 | 630ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-20 06:23:49 | 2502ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-16 23:57:58 | 35806ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-16 23:12:24 | 500ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-16 23:10:46 | 1530ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-16 23:01:11 | 531ms | 2 NS 1 A 1 MX | 🔓 Insecure |