nikolajholck.dk is a .dk domain served by 2 nameservers (elle.ns.cloudflare.com, todd.ns.cloudflare.com). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.45.181 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mail.protonmail.ch, mailsec.protonmail.ch. The zone is not DNSSEC-signed, 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 |
|---|---|---|---|---|---|---|---|
| 104.21.45.181 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.218.3 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3034::6815:2db5 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3036::ac43:da03 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.45.181,172.67.218.3 ech=AEX+DQBBWwAgACCmoeJJ3waQTbraahfkHvFbT/+qTCROusJ+czi3bE+OCgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3034::6815:2db5,2606:4700:3036::ac43:da03 |
| 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 | 6111A5698D23C89E09C36FF833C1487E… |
| SMTP _25._tcp.mailsec.protonmail.ch | DANE-EE · SPKI · SHA-256 | 76BB66711DA416433CA890A5B2E5A053… |
| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2410281085 |
| Primary NS (MNAME) | elle.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| 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 shown | 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 | 2574ms | 2 NS 1 A 2 MX | 🔒 Secure |