principia.dk is a .dk domain served by 2 nameservers (johnny.ns.cloudflare.com, sima.ns.cloudflare.com). It was registered on 18 December 1996 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.10.19 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by principia-dk.mail.protection.outlook.com. 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 |
|---|---|---|---|---|---|---|---|
| 104.21.10.19 | — | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.162.31 | — | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 188.114.97.1 |
| 🔶 Autoconfig | 104.21.10.19 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3032::ac43:a21f | — | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3036::6815:a13 | — | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.10.19,172.67.162.31 ech=AEX+DQBB+gAgACDXo7/7SbY1FdAaP7bfge0cVMs2IPJyyK+rgWhh7CQ0awAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3032::ac43:a21f,2606:4700:3036::6815:a13 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _sipfederationtls._tcp | 100 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| MS=ms51338895 |
| v=spf1 include:_spf62510.spf-protect.dk -all |
| Policy | Record (principia.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf62510.spf-protect.dk -all |
| Policy | Record (_dmarc.principia.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:6718fc5a06b4e@dmarc-dk.centerasecurity.com; |
| www | 104.21.10.19 172.67.162.31 2606:4700:3032::6815:a13 2606:4700:3033::ac43:a21f (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network principia.dk: 104.21.10.19 172.67.162.31 2606:4700:3032::6815:a13 2606:4700:3033::ac43:a21f (AS13335) www.principia.dk: 104.21.10.19 172.67.162.31 2606:4700:3032::6815:a13 2606:4700:3033::ac43:a21f (AS13335) |
| Wildcard | Yes: any name under the zone resolves |
| CDS / CDNSKEY | Delete signal: the zone asks the registry to remove its DS (go insecure) 1 CDS, 1 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| selector1 | selector1-principia-dk._domainkey.hfchristiansen.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 | 2407090509 |
| Primary NS (MNAME) | johnny.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | InterNetX GmbH |
| Registered | 1996-12-18 |
| Expires | 2026-12-31 (69d) |
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).
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-15 10:41:08 | 2853ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-21 21:51:30 | 1129ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-20 05:22:55 | 1440ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-07 22:24:40 | 1564ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-03 23:34:22 | 839ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-27 17:45:23 | 1412ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-22 16:13:49 | 2330ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-18 07:55:30 | 5295ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-06 18:15:29 | 2055ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-07-20 03:10:17 | 1856ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-07-11 08:45:35 | 3650ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-22 21:11:54 | 2869ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-17 23:54:22 shown | 1135ms | 2 NS 2 A 1 MX | 🔒 Secure |