f-construction.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 18 April 2020 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 91.221.196.224 is hosted by One.com A/S (AS51468) in Denmark. Mail is handled by fconstruction-dk0c.mail.protection.outlook.com. The zone is DNSSEC-signed and validates, has no 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.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns01.one.com | — | — | — |
| ns02.one.com | — | — | — |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 91.221.196.224 | — | — | AS51468 | One.com A/S | 91.221.196.0/23 | 🇩🇰 Denmark | Copenhagen |
| TXT Record |
|---|
| MS=ms63822287 |
| v=spf1 include:spf.protection.outlook.com -all |
| Policy | Record (f-construction.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com -all |
| www | 91.221.196.224 (AS51468) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
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 | 2026061401 |
| 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 | ONE.COM A/S |
| Registered | 2020-04-18 |
| Expires | 2028-04-30 (559d) |
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 |
|---|---|---|---|
| 2026-10-18 07:21:38 | 1071ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-12 02:53:48 | 1428ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-03 12:23:48 | 943ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-01 03:03:19 | 1392ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-15 12:42:22 | 1353ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-27 21:54:04 | 888ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-27 04:18:43 | 1323ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-14 16:09:27 | 1953ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-14 15:34:27 | 10375ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-02 00:46:10 | 836ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 09:09:51 shown | 1387ms | 2 NS 1 A 1 MX | 🔒 Secure |