opentech.dk is a .dk domain served by 2 nameservers (eve.ns.cloudflare.com, nicolas.ns.cloudflare.com). It was registered on 12 January 2020 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.35.241 is hosted by Cloudflare, Inc. (AS13335). The zone is not DNSSEC-signed, has no DMARC policy and is reachable over IPv6. 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 |
|---|---|---|---|---|---|---|---|
| 104.21.35.241 | — | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.181.122 | — | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3031::6815:23f1 | — | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3032::ac43:b57a | — | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.35.241,172.67.181.122 ech=AEX+DQBBOwAgACAG1eGjqSgaba5UXmh5eE84iX3ffsXq/5DpIUhEmpCbbQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3031::6815:23f1,2606:4700:3032::ac43:b57a |
| www | 104.21.35.241 172.67.181.122 2606:4700:3031::6815:23f1 2606:4700:3033::ac43:b57a (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network opentech.dk: 104.21.35.241 172.67.181.122 2606:4700:3031::6815:23f1 2606:4700:3033::ac43:b57a (AS13335) www.opentech.dk: 104.21.35.241 172.67.181.122 2606:4700:3031::6815:23f1 2606:4700:3033::ac43:b57a (AS13335) |
| 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 | 2406120966 |
| Primary NS (MNAME) | eve.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Obsidian Digital A/S |
| Registered | 2020-01-12 |
| Expires | 2027-01-31 (104d) |
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).
Showing 100 of 846.
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-11 08:53:58 | 2455ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-24 15:28:05 | 2490ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-14 21:56:02 | 1883ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-14 23:19:19 | 1125ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-07-16 00:59:08 | 893ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-26 15:58:00 | 2083ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-25 01:59:36 | 1043ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-24 03:27:30 | 1107ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-21 01:20:57 | 813ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-17 14:37:18 shown | 1776ms | 2 NS 2 A 0 MX | 🔓 Insecure |