sudoku-master.dk is a .dk domain served by 2 nameservers (ns1.yoursrs.com, ns2.yoursrs.com). It was registered on 12 October 2005 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 87.213.9.179 is hosted by Odido Netherlands B.V. (AS13127) 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 |
|---|---|---|---|---|---|---|---|
| 87.213.9.179 | 3600s | — | AS13127 | Odido Netherlands B.V. | 87.213.0.0/16 | 🇳🇱 The Netherlands | Vianen |
| TXT Record |
|---|
| v=spf1 include:spf.protection.outlook.com include:spf.keesing.com -all |
| Policy | Record (sudoku-master.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com include:spf.keesing.com -all |
| Policy | Record (_dmarc.sudoku-master.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:aggregate@keesing.net,mailto:dmarc_agg@vali.email; ruf=mailto:forensicreports@keesing.net; fo=1; adkim=s; aspf=s |
| www | NXDOMAIN |
| www vs bare domain | www does not resolve (all like this) |
| Wildcard | No |
DNS lookups: 2/10 · 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 | 2023071203 |
| Primary NS (MNAME) | ns1.yoursrs.com |
| Responsible (RNAME) | hosting@keesing.com |
| Refresh | 3600s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Realtime Register B.V. |
| Registered | 2005-10-12 |
| Expires | 2026-10-31 (13d) |
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).
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-24 01:11:00 shown | 596ms | 2 NS 1 A 0 MX | 🔓 Insecure |
| 2026-08-28 01:53:21 | 659ms | 2 NS 1 A 0 MX | 🔓 Insecure |
| 2026-08-27 04:41:06 | 673ms | 2 NS 1 A 0 MX | 🔓 Insecure |
| 2026-06-25 18:51:19 | 1556ms | 2 NS 1 A 0 MX | 🔓 Insecure |
| 2026-06-19 23:14:37 | 2538ms | 2 NS 1 A 0 MX | 🔓 Insecure |
| 2026-06-17 12:55:25 | 1904ms | 2 NS 1 A 0 MX | 🔓 Insecure |