4plus4.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 21 October 2005 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 46.30.215.143 is hosted by One.com A/S (AS51468) in Denmark. Mail is handled by 4plus4-dk.mail.protection.outlook.com. 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 |
|---|---|---|---|---|---|---|---|
| 46.30.215.143 | — | webcluster1.webpod17-cph3.one.com | AS51468 | One.com A/S | 46.30.208.0/21 | 🇩🇰 Denmark | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2a02:2350:5:106:7e:b3d8:abae:c952 | — | — | AS51468 | One.com A/S | 2a02:2350:0:0:0:0:0:0/32 | 🇩🇰 Denmark | Copenhagen |
| TXT Record |
|---|
| v=spf1 include:spf.protection.outlook.com -all |
| Policy | Record (4plus4.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com -all |
| www | 46.30.215.152 2a02:2350:5:106:c5:9fc8:d32d:b724 (AS51468) (address records, no CNAME) |
| www vs bare domain | Same network 4plus4.dk: 46.30.215.152 2a02:2350:5:106:c5:9fc8:d32d:b724 (AS51468) www.4plus4.dk: 46.30.215.152 2a02:2350:5:106:c5:9fc8:d32d:b724 (AS51468) |
| Wildcard | No |
| Denial of existence | NSEC3 · 0 iterations · no salt RFC 9276 ✓ |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| selector1 | selector1-4plus4-dk._domainkey.4plus4.onmicrosoft.com | RSA · ~1024 bit below 2048 bit |
DKIM selectors can't be listed, so we check the common ones (Microsoft 365, Google, Mailchimp, SendGrid, generic). Keys under other selectors aren't shown.
DNS lookups: 1/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026060702 |
| 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 | 2005-10-21 |
| Expires | 2029-04-30 (925d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-08 05:07:28 | 1021ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-05 17:35:04 | 2702ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-29 17:02:56 | 992ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-24 13:12:05 | 1094ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-22 04:25:38 | 5219ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-02 15:46:48 | 3284ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-29 20:56:53 | 2294ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-26 16:18:08 | 1543ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-09 12:26:59 | 6163ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-02 08:24:38 | 6023ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-24 21:06:18 | 1404ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-23 19:13:41 | 5326ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-19 10:41:35 | 6608ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-14 15:49:28 | 5066ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-24 04:04:47 | 1877ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-16 12:51:21 shown | 1666ms | 2 NS 1 A 1 MX | 🔒 Secure |