c4r.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 21 December 2009 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 46.30.213.91 is hosted by One.com A/S (AS51468) in Denmark. Mail is handled by mx1.pub.mailpod13-cph3.one.com, mx2.pub.mailpod13-cph3.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 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 |
|---|---|---|---|---|---|---|---|
| 46.30.213.91 | 3600s | webcluster1.webpod13-cph3.one.com | AS51468 | One.com A/S | 46.30.208.0/21 | 🇩🇰 Denmark | Copenhagen |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 10800s | mx1.pub.mailpod13-cph3.one.com | 185.10.9.42 | mx1.pub.mailpod13-cph3.one.com | AS51468 One.com A/S |
| 10 | 10800s | mx2.pub.mailpod13-cph3.one.com | 185.10.9.43 | mx2.pub.mailpod13-cph3.one.com | AS51468 One.com A/S |
| 10 | 10800s | mx3.pub.mailpod13-cph3.one.com | 185.10.9.44 | mx3.pub.mailpod13-cph3.one.com | AS51468 One.com A/S |
| 10 | 10800s | mx4.pub.mailpod13-cph3.one.com | 185.10.9.45 | mx4.pub.mailpod13-cph3.one.com | AS51468 One.com A/S |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2a02:2350:5:10b:dd:f3ae:735e:5759 | 3600s | — | AS51468 | One.com A/S | 2a02:2350:0:0:0:0:0:0/32 | 🇩🇰 Denmark | Copenhagen |
| TXT Record |
|---|
| v=spf1 include:_custspf.one.com ~all |
| Policy | Record (c4r.dk) |
|---|---|
| ~all (soft fail) | v=spf1 include:_custspf.one.com ~all |
| www | 46.30.213.91 2a02:2350:5:10b:dd:f3ae:735e:5759 (AS51468) (address records, no CNAME) |
| www vs bare domain | Same network c4r.dk: 46.30.213.91 2a02:2350:5:10b:dd:f3ae:735e:5759 (AS51468) www.c4r.dk: 46.30.213.91 2a02:2350:5:10b:dd:f3ae:735e:5759 (AS51468) |
| Wildcard | No |
| Denial of existence | NSEC3 · 0 iterations · no salt RFC 9276 ✓ |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 1/10 · policy: ~all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx1.pub.mailpod13-cph3.one.com | DANE-EE · SPKI · SHA-256 | BE8C554E6A2A9BFE9F87080F0AE71BAD… |
| SMTP _25._tcp.mx2.pub.mailpod13-cph3.one.com | DANE-EE · SPKI · SHA-256 | BE8C554E6A2A9BFE9F87080F0AE71BAD… |
| SMTP _25._tcp.mx3.pub.mailpod13-cph3.one.com | DANE-EE · SPKI · SHA-256 | BE8C554E6A2A9BFE9F87080F0AE71BAD… |
| SMTP _25._tcp.mx4.pub.mailpod13-cph3.one.com | DANE-EE · SPKI · SHA-256 | BE8C554E6A2A9BFE9F87080F0AE71BAD… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026101001 |
| 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 | 2009-12-21 |
| Expires | 2026-12-31 (74d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-10 16:59:17 shown | 441ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-09-09 21:28:08 | 858ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-08-29 04:47:10 | 633ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-08-19 01:54:03 | 3389ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-08-10 15:36:22 | 1034ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-07-27 00:53:26 | 17039ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-07-12 03:35:22 | 18645ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-06-25 08:40:30 | 812ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-06-20 04:00:50 | 795ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-06-16 18:50:06 | 812ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-06-16 18:40:59 | 785ms | 2 NS 1 A 4 MX | 🔒 Secure |