niemann.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 26 December 2017 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 91.221.196.240 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, has no DMARC policy and has no IPv6 address. 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 |
|---|---|---|---|---|---|---|---|
| 91.221.196.240 | 43200s | — | AS51468 | One.com A/S | 91.221.196.0/23 | 🇩🇰 Denmark | Copenhagen |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | niemann.dk → 91.221.196.240 |
| 🔶 Autoconfig | niemann.dk → 91.221.196.240 |
| TXT Record |
|---|
| protonmail-verification=a9dbd132c711579dd77d50e26b16588580665c4d |
| v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC5Dv+dBafQvHiCAGExtJQEIiukFUOhlSJf/IPCbDR9WB36vSh1eOqsFAwHNSgVHAroHl1B/Q1S6T7JhUGOm6FCUawufDsRlrzKZl0eoAjeZnp9vO/QomOXnkMr3daYcYFMIweoV/RdxIv9vATidfQl+87WSU2JqyKApYMz/0WxswIDAQAB |
| www CNAME | niemann.dk (all on niemann.dk) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| default | niemann.dk | RSA · ~1024 bit below 2048 bit |
| dkim | niemann.dk | RSA · ~1024 bit below 2048 bit |
| k1 | niemann.dk | RSA · ~1024 bit below 2048 bit |
| niemann.dk | RSA Invalid key data — receivers can't verify signatures | |
| s1 | niemann.dk | RSA · ~1024 bit below 2048 bit |
| s2 | niemann.dk | RSA Invalid key data — receivers can't verify signatures |
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.
| Type | Name | Value |
|---|---|---|
| CNAME | _acme-challenge.niemann.dk | niemann.dk |
| TXT | niemann.dk | protonmail-verification=a9dbd132c711579dd77d50e26b16588580665c4d |
| 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 | 2026101101 |
| 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 | 2017-12-26 |
| Expires | 2028-12-31 (804d) |
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 |
|---|---|---|---|
| 2026-10-11 15:06:03 shown | 1554ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-30 01:59:02 | 662ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-13 20:14:44 | 1001ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-28 00:04:14 | 947ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-27 06:40:09 | 883ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-12 04:47:41 | 1144ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-18 12:38:23 | 1044ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-12 11:47:54 | 9057ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-24 17:18:48 | 949ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-21 12:44:41 | 1149ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-18 02:28:44 | 6824ms | 2 NS 1 A 2 MX | 🔒 Secure |