st21.dk is a .dk domain served by 2 nameservers (athena.ns.cloudflare.com, brodie.ns.cloudflare.com). It was registered on 9 March 2022 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 91.226.145.173 is hosted by Netnoerden ApS (AS216275) in Denmark. Mail is handled by pmg.st21.dk. The zone is not DNSSEC-signed, publishes a DMARC policy and has no IPv6 address. 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 |
|---|---|---|---|---|---|---|---|
| 91.226.145.173 | 300s | — | AS216275 | Netnoerden ApS | 91.226.144.0/23 | 🇩🇰 Denmark | Copenhagen |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 300s | pmg.st21.dk | 91.226.145.173 | pmg.st21.dk | AS216275 Netnoerden ApS |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | mail.st21.dk → 91.226.145.173 |
| 🔶 Autoconfig | 91.226.145.173 |
| TXT Record |
|---|
| google-site-verification=nCrSAxOcjdbPZWWQwwln6Fz8SR3DKD1gkO_AB5lMpQI |
| v=spf1 include:dnsexit.com ip4:91.226.145.173 -all |
| Policy | Record (st21.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:dnsexit.com ip4:91.226.145.173 -all |
| Policy | Record (_dmarc.st21.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; rua=mailto:ipm5q1t@ar.glockapps.com; |
| www | 91.226.145.173 (AS216275) (address records, no CNAME) |
| www vs bare domain | Same network |
| 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 |
DNS lookups: 1/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✓ Found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2416085165 |
| Primary NS (MNAME) | athena.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Simply.com A/S |
| Registered | 2022-03-09 |
| Expires | 2028-03-08 (501d) |
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 |
|---|---|---|---|
| 2026-10-19 17:29:21 | 3566ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-04 00:44:11 | 4469ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-03 00:39:53 | 4441ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-01 00:31:45 | 2499ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-30 07:14:57 shown | 4447ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-28 20:55:15 | 1138ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-27 20:45:31 | 1876ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-23 19:07:53 | 1714ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-18 08:19:46 | 2166ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-11 06:39:26 | 2036ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-27 06:16:20 | 2889ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-16 12:15:49 | 5081ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-05 22:14:55 | 957ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-03 02:38:50 | 1068ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-07-23 18:14:08 | 7478ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-07-21 14:59:47 | 1018ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-07-17 11:46:59 | 901ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-07-01 04:57:21 | 1333ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-27 22:44:51 | 769ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-17 12:14:44 | 1034ms | 2 NS 1 A 1 MX | 🔓 Insecure |