double-u.dk is a .dk domain served by 2 nameservers (diana.ns.cloudflare.com, piers.ns.cloudflare.com). It was registered on 22 September 1999 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.20.205.49 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by mx1.onlinemail.io, mx2.onlinemail.io. The zone is not DNSSEC-signed, has no DMARC policy and has no IPv6 address. 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 |
|---|---|---|---|---|---|---|---|
| 185.20.205.49 | 3600s | linux375.unoeuro.com | AS48854 | team.blue Denmark A/S | 185.20.204.0/22 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | mx1.onlinemail.io | 185.21.42.12 | mx1.onlinemail.io | AS48854 team.blue Denmark A/S |
| 20 | 3600s | mx2.onlinemail.io | 46.36.208.16 | mx2.onlinemail.io | AS48854 team.blue Denmark A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover-mf.onlinemail.io → 185.21.40.62 |
| 🔶 Autoconfig | autoconfig-mf.onlinemail.io → 185.21.40.62 |
| TXT Record |
|---|
| google-site-verification=BbM7nffrzgpD1L6EyAY6-qHq9zMZM2KHOeSECcXSu74 |
| v=spf1 include:spf.onlinemail.io -all |
| Policy | Record (double-u.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.onlinemail.io -all |
| www CNAME | double-u.dk (all on double-u.dk) → 185.20.205.49 (AS48854) |
| www vs bare domain | Same network |
| Wildcard | No |
DNS lookups: 3/10 · 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 | 2410542604 |
| Primary NS (MNAME) | diana.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 1999-09-22 |
| Expires | 2027-09-30 (348d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-08 01:48:15 | 991ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-09-25 21:25:50 | 2414ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-09-24 00:48:11 | 622ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-08-10 08:19:42 | 2892ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-07-27 00:39:33 shown | 2905ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-19 23:32:01 | 510ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-17 04:21:15 | 549ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-17 04:20:21 | 424ms | 2 NS 1 A 2 MX | 🔓 Insecure |