f01.dk is a .dk domain served by 2 nameservers (demi.ns.cloudflare.com, duke.ns.cloudflare.com). It was registered on 8 November 2021 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Mail is handled by mx.f01.dk. The zone is DNSSEC-signed and validates, 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.
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 0 | 300s | mx.f01.dk | 139.144.73.109 2a01:7e01::f03c:93ff:fe17:44b0 |
mx.f01.dk — |
AS63949 Akamai Connected Cloud AS63949 Akamai Connected Cloud |
| TXT Record |
|---|
| google-site-verification=6kSEsidr46syoBukhTsQbDt-QUVKbCMJW1DvPvO1178 |
| v=spf1 a mx a:mx.f01.dk -all |
| Policy | Record (f01.dk) |
|---|---|
| -all (hard fail) | v=spf1 a mx a:mx.f01.dk -all |
| Policy | Record (_dmarc.f01.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; sp=reject; adkim=s; aspf=s; rua=mailto:webmaster@folkmann.it; ruf=mailto:webmaster@folkmann.it; |
| www | Exists, no address |
| www vs bare domain | Neither resolves f01.dk: no address www.f01.dk: no address |
| Wildcard | No |
| Denial of existence | Compact NSEC (RFC 9824, "black lies") not walkable |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| dkim | — | 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.
DNS lookups: 3/10 · policy: -all
No problems found| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.f01.dk | 2QAoKkfXHzfczERb4MPVhmJm_YT3oiXf4HkKK4Ql-jM |
| TXT | _acme-challenge.f01.dk | pvPD1V92Nsm8lfTYYxy2Y_7r-HofMu4pTnzcctlgCrg |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | resolution failed: ncache nxrrset |
| Field | Value |
|---|---|
| Serial | 2417391482 |
| Primary NS (MNAME) | demi.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Domænehajen ApS |
| Registered | 2021-11-08 |
| Expires | 2026-11-07 (21d) |
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).
| Domain | Registrar |
|---|---|
| datababs.dk | Domænehajen ApS |
| f00.dk | Domænehajen ApS |
| f02.dk | Domænehajen ApS |
| interbabs.dk | Domænehajen ApS |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-16 12:59:17 | 1156ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-10-14 09:00:30 shown | 2307ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-10-13 08:26:38 | 592ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-07 04:18:32 | 1571ms | 5 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-25 02:35:44 | 17373ms | 5 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-25 22:19:53 | 4642ms | 5 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-25 20:56:57 | 1231ms | 5 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-17 09:10:43 | 1658ms | 5 NS 1 A 1 MX | 🔓 Insecure |