challenge.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 20 January 1998 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 87.59.201.211 is hosted by TDC Holding A/S (AS3292) in Denmark. Mail is handled by mx1.pub.mailpod8-cph3.one.com, mx2.pub.mailpod8-cph3.one.com and 1 more. The zone is DNSSEC-signed and validates, has no 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 |
|---|---|---|---|---|---|---|---|
| 87.59.201.211 | 86400s | 87-59-201-211-cable.dk.customer.tdc.net | AS3292 | TDC Holding A/S | 87.59.0.0/16 | 🇩🇰 Denmark | Kongens Lyngby |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 10800s | mx1.pub.mailpod8-cph3.one.com | 185.164.14.102 | mx1.pub.mailpod8-cph3.one.com | AS51468 One.com A/S |
| 10 | 10800s | mx2.pub.mailpod8-cph3.one.com | 185.164.14.103 | mx2.pub.mailpod8-cph3.one.com | AS51468 One.com A/S |
| 10 | 10800s | mx3.pub.mailpod8-cph3.one.com | 185.164.14.104 | mx3.pub.mailpod8-cph3.one.com | AS51468 One.com A/S |
| www | 87.59.201.211 (AS3292) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC3 · 0 iterations · no salt RFC 9276 ✓ |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx1.pub.mailpod8-cph3.one.com | DANE-EE · SPKI · SHA-256 | E7531AB55E1935413AA5EC5366CF909D… |
| SMTP _25._tcp.mx2.pub.mailpod8-cph3.one.com | DANE-EE · SPKI · SHA-256 | E7531AB55E1935413AA5EC5366CF909D… |
| SMTP _25._tcp.mx3.pub.mailpod8-cph3.one.com | DANE-EE · SPKI · SHA-256 | E7531AB55E1935413AA5EC5366CF909D… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026101701 |
| Primary NS (MNAME) | ns01.one.com |
| Responsible (RNAME) | hostmaster@one.com |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 600s |
| Field | Value |
|---|---|
| Registrar | ONE.COM A/S |
| Registered | 1998-01-20 |
| Expires | 2027-03-31 (159d) |
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).
| Domain | Registrar |
|---|---|
| dydensborg.dk | ONE.COM A/S |
| madsdydensborg.dk | ONE.COM A/S |
| radikale-frederikssund.dk | Punktum dk A/S (direct) |
| rune-christiansen.dk | ONE.COM A/S |
| runechristiansen.dk | ONE.COM A/S |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-22 02:55:28 shown | 525ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-10-17 18:43:43 | 511ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-10-14 16:41:36 | 666ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-10-12 13:02:25 | 1118ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-10-11 11:07:31 | 670ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-30 23:31:19 | 553ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-09-30 09:27:35 | 949ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-09-24 08:15:33 | 571ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-15 16:18:24 | 618ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-08-25 15:22:26 | 670ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-08-23 19:54:15 | 2837ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-24 15:00:26 | 2114ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-22 09:37:37 | 1203ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-21 13:09:16 | 547ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-16 20:15:58 | 697ms | 2 NS 1 A 3 MX | 🔒 Secure |