nikolajholck.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 46.30.215.189 is hosted by One.com A/S (AS51468) in Denmark. Mail is handled by mail.protonmail.ch, mailsec.protonmail.ch. The zone is DNSSEC-signed and validates, publishes a 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 46.30.215.189 | — | webcluster2.webpod17-cph3.one.com | AS51468 | One.com A/S | 46.30.208.0/21 | 🇩🇰 Denmark | Copenhagen |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2a02:2350:5:106:80ec:4aae:e2e7:ec92 | — | — | AS51468 | One.com A/S | 2a02:2350:0:0:0:0:0:0/32 | 🇩🇰 Denmark | Copenhagen |
| TXT Record |
|---|
| protonmail-verification=0b63f9ee8a77346f7c6ab1637dca785026fcc8c6 |
| v=spf1 include:_spf.protonmail.ch ~all |
| Policy | Record (nikolajholck.dk) |
|---|---|
| ~all (soft fail) | v=spf1 include:_spf.protonmail.ch ~all |
| Policy | Record (_dmarc.nikolajholck.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine |
| www | 104.21.45.181 172.67.218.3 2606:4700:3034::6815:2db5 2606:4700:3036::ac43:da03 (AS13335) (address records, no CNAME) |
| www vs bare domain | Different networks nikolajholck.dk: 88.218.3.190 2a0d:5600:1a:26::2 (AS9009) (all like this)www.nikolajholck.dk: 104.21.45.181 172.67.218.3 2606:4700:3034::6815:2db5 2606:4700:3036::ac43:da03 (AS13335) |
| Wildcard | No |
DNS lookups: 2/10 · policy: ~all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mail.protonmail.ch | DANE-EE · SPKI · SHA-256 | 6111A5698D23C89E09C36FF833C1487E… |
| SMTP _25._tcp.mail.protonmail.ch | DANE-EE · SPKI · SHA-256 | 76BB66711DA416433CA890A5B2E5A053… |
| SMTP _25._tcp.mailsec.protonmail.ch | DANE-EE · SPKI · SHA-256 | 76BB66711DA416433CA890A5B2E5A053… |
| SMTP _25._tcp.mailsec.protonmail.ch | DANE-EE · SPKI · SHA-256 | 6111A5698D23C89E09C36FF833C1487E… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026060201 |
| Primary NS (MNAME) | ns01.one.com |
| Responsible (RNAME) | hostmaster@one.com |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 600s |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-24 11:28:06 | 9624ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-09-23 19:47:09 | 881ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-08-27 04:38:13 | 1226ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-08-25 11:02:48 | 1011ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-07-27 15:54:37 | 1347ms | 2 NS 1 A 2 MX | ❓ Unknown |
| 2026-07-24 13:37:53 | 10681ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-07-23 10:29:54 | 2131ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-06-24 17:55:49 | 514ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-21 12:23:04 | 1003ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-17 13:19:56 shown | 2574ms | 2 NS 1 A 2 MX | 🔒 Secure |