4blue.dk is a .dk domain served by 3 nameservers (ns3.firstfind.nl, ns4.firstfind.nl, ns5.firstfind.net). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 5.157.87.204 is hosted by Your Hosting B.V. (AS48635) in The Netherlands. The zone is not DNSSEC-signed, publishes a 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 |
|---|---|---|---|---|---|---|---|
| 5.157.87.204 | 100s | redirect.yourhosting.nl | AS48635 | Your Hosting B.V. | 5.157.80.0/21 | 🇳🇱 The Netherlands | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 5.157.87.204 |
| 🔶 Autoconfig | 5.157.87.204 |
| TXT Record |
|---|
| v=spf1 -all |
| Policy | Record (4blue.dk) |
|---|---|
| -all (hard fail) | v=spf1 -all |
| Policy | Record (_dmarc.4blue.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; fo=1 |
| www CNAME | 4blue.dk (all on 4blue.dk) → 5.157.87.204 (AS48635) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
DNS lookups: 0/10 · policy: -all
No problems found| 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 | 2025070300 |
| Primary NS (MNAME) | ns3.firstfind.nl |
| Responsible (RNAME) | hostmaster@firstfind.nl |
| Refresh | 16384s |
| Retry | 2048s |
| Expire | 1048576s |
| Minimum (neg-cache TTL) | 14400s |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-16 12:05:18 shown | 2132ms | 3 NS 1 A 0 MX | 🔓 Insecure |
| 2026-06-25 08:44:40 | 4726ms | 3 NS 1 A 0 MX | 🔓 Insecure |
| 2026-06-20 04:36:54 | 633ms | 3 NS 1 A 0 MX | 🔓 Insecure |
| 2026-06-16 12:55:17 | 1202ms | 3 NS 1 A 0 MX | 🔓 Insecure |