crsystem.dk is a .dk domain served by 2 nameservers (alex.ns.cloudflare.com, ingrid.ns.cloudflare.com). It was registered on 19 August 2026 (WHOIS) and first appeared in the .dk zone on 20 August 2026. Its website address 104.21.51.141 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 |
|---|---|---|---|---|---|---|---|
| 104.21.51.141 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.181.42 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 172.67.181.42 |
| 🔶 Autoconfig | 172.67.181.42 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3035::6815:338d | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::ac43:b52a | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.51.141,172.67.181.42 ech=AEX+DQBBXwAgACBjTmLUSwKDFLLUTTzCMyhH8MAC+DBiiXgRgNYhreqPDQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3035::6815:338d,2606:4700:3037::ac43:b52a |
| www | Address record (no CNAME) |
| Wildcard | Yes: any name under the zone resolves |
| Selector | CNAME | Key |
|---|---|---|
| selector1 | selector1-crsystem-dk._domainkey.crelectricdk.d-v1.dkim.mail.microsoft | RSA · ~2048 bit |
| selector2 | selector2-crsystem-dk._domainkey.crelectricdk.d-v1.dkim.mail.microsoft | RSA · ~2048 bit |
DKIM selectors can't be listed, so we check the common ones (Microsoft 365, Google, Mailchimp, SendGrid, generic). Keys under other selectors aren't shown.
| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.crsystem.dk | BmDF45YcKPcb5KIoauORtIryT8dRoGqqk2BRLBi58cg |
| TXT | _acme-challenge.crsystem.dk | fCrjTv5eFgmtV0C9LpEW2cOtRnwCx2yEoBF0AgyqP7k |
| 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 | 2412746877 |
| Primary NS (MNAME) | alex.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | DANDOMAIN A/S |
| Registered | 2026-08-19 |
| Expires | 2027-08-18 (305d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-29 19:52:55 | 1085ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-26 22:59:01 | 905ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-12 10:57:17 | 1371ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-29 02:01:23 | 2918ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-26 23:27:15 | 778ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-22 09:51:50 | 1266ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-21 09:40:20 shown | 3703ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-20 08:50:36 | 721ms | 2 NS 1 A 0 MX | 🔓 Insecure |