51cth.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 16 December 2018 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 46.30.213.75 is hosted by One.com A/S (AS51468) in Denmark. Mail is handled by mx1.mailpod15-cph3.g1i.one.com, mx2.mailpod15-cph3.g1i.one.com and 2 more. The zone is DNSSEC-signed and validates, 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.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns01.one.com | — | — | — |
| ns02.one.com | — | — | — |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 46.30.213.75 | — | webcluster1.webpod13-cph3.one.com | AS51468 | One.com A/S | 46.30.208.0/21 | 🇩🇰 Denmark | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2a02:2350:5:10b:58:b4ac:1a2f:1d76 | — | — | AS51468 | One.com A/S | 2a02:2350:0:0:0:0:0:0/32 | 🇩🇰 Denmark | Copenhagen |
| www | 46.30.213.75 2a02:2350:5:10b:58:b4ac:1a2f:1d76 (AS51468) (address records, no CNAME) |
| www vs bare domain | Same network 51cth.dk: 46.30.213.75 2a02:2350:5:10b:58:b4ac:1a2f:1d76 (AS51468) www.51cth.dk: 46.30.213.75 2a02:2350:5:10b:58:b4ac:1a2f:1d76 (AS51468) |
| 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.mailpod15-cph3.g1i.one.com | DANE-EE · SPKI · SHA-256 | DB00CDA1DB82CC93CBF96D7D5806F329… |
| SMTP _25._tcp.mx2.mailpod15-cph3.g1i.one.com | DANE-EE · SPKI · SHA-256 | DB00CDA1DB82CC93CBF96D7D5806F329… |
| SMTP _25._tcp.mx3.mailpod15-cph3.g1i.one.com | DANE-EE · SPKI · SHA-256 | DB00CDA1DB82CC93CBF96D7D5806F329… |
| SMTP _25._tcp.mx4.mailpod15-cph3.g1i.one.com | DANE-EE · SPKI · SHA-256 | DB00CDA1DB82CC93CBF96D7D5806F329… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026053001 |
| 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 | Punktum dk A/S (direct) |
| Registered | 2018-12-16 |
| Expires | 2026-12-31 (73d) |
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).
No other domain with this registrant in our WHOIS data yet| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-07 23:52:05 | 528ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-10-02 03:49:52 | 876ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-08-31 16:00:04 | 605ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-08-26 12:59:46 | 9602ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-08-23 06:17:38 | 5736ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-08-01 14:25:25 | 8759ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-07-01 01:38:34 | 3088ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-06-29 18:51:56 | 685ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-06-24 11:15:38 | 961ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-16 12:53:53 shown | 1770ms | 2 NS 1 A 4 MX | 🔒 Secure |