f5.dk is a .dk domain served by 2 nameservers (lady.ns.cloudflare.com, yahir.ns.cloudflare.com). It was registered on 29 August 2003 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.11.187 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by f5-dk.mail.protection.outlook.com, smtp.google.com. The zone is not DNSSEC-signed, 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 |
|---|---|---|---|---|---|---|---|
| 104.21.11.187 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.150.7 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 40.104.116.24 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3035::6815:bbb | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3036::ac43:9607 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.11.187,172.67.150.7 ech=AEX+DQBByAAgACBnsjgpLWsFiREkbUChrz4Wa/f1brTuodHl6zLoGGpsUwAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3035::6815:bbb,2606:4700:3036::ac43:9607 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _sipfederationtls._tcp | 100 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| brevo-code:1ab93d96a5e3661d779d3ae1cb9cdf9b |
| cisco-ci-domain-verification=520e3e486193f38c6c560bd65c5e7769dd68c01c19dbfa31fd1eae1946f4cd7b |
| google-site-verification=uigcdFsvCxtzUJX_Mu8yE0gA97Ci7Ju9qQgiw-RT5yg |
| MS=3ABFA9EF7D2CE3D9AB9BF3917522CB6E4B6E70C9 |
| MS=ms14421548 |
| pardot892261=7a778077f50eec28d59c89396805a4b21af34f3f0e5e2fa057f43275a72514e0 |
| twilio-domain-verification=6834a3565d662b57118fc0c18fa8f88f |
| v=spf1 include:t418g86ox0u7r4yz.p.tawk.email include:spf.protection.outlook.com include:autopilotmail.com include:spf.eu.signature365.net -all |
| Policy | Record (f5.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:t418g86ox0u7r4yz.p.tawk.email include:spf.protection.outlook.com include:autopilotmail.com include:spf.eu.signature365.net -all |
| Policy | Record (_dmarc.f5.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine; rua=mailto:rua+pdibyph0vmz3@dmarcwise.email; |
| Status | Report address (rua) |
|---|---|
| ✓ Enabled | mailto:rua+pdibyph0vmz3@dmarcwise.email |
| Flags | Tag | Value |
|---|---|---|
| 0 | issue | comodoca.com |
| 0 | issue | digicert.com; cansignhttpexchanges=yes |
| 0 | issue | letsencrypt.org |
| 0 | issue | pki.goog; cansignhttpexchanges=yes |
| 0 | issue | ssl.com |
| 0 | issuewild | comodoca.com |
| 0 | issuewild | digicert.com; cansignhttpexchanges=yes |
| 0 | issuewild | letsencrypt.org |
| 0 | issuewild | pki.goog; cansignhttpexchanges=yes |
| 0 | issuewild | ssl.com |
| www | 104.21.11.187 172.67.150.7 2606:4700:3035::6815:bbb 2606:4700:3036::ac43:9607 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Selector | CNAME | Key |
|---|---|---|
| — | RSA · ~1024 bit below 2048 bit | |
| k1 | dkim.mcsv.net | RSA · ~1024 bit below 2048 bit |
| — | RSA · ~1024 bit below 2048 bit | |
| s1 | s1.domainkey.u24695452.wl203.sendgrid.net | RSA · ~2048 bit |
| s2 | s2.domainkey.u24695452.wl203.sendgrid.net | RSA · ~2048 bit |
| selector1 | selector1-f5-dk._domainkey.f5dk365.onmicrosoft.com | RSA · ~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: 7/10 · policy: -all
No problems found| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.f5.dk | 3_wIJrGyT2NCkNdnH-5yu16okL1hd1caft_IysvWp4E |
| TXT | _acme-challenge.f5.dk | mk5-81OiyQuLNeRycWs2cekMFIuv9dGnoxPHNIo2ztw |
| TXT | _acme-challenge.f5.dk | wykjZXeELXvqbpQcB-wGDR9GwnIJEomBM-FBB9MKB4s |
| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2415935493 |
| Primary NS (MNAME) | lady.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | CURANET A/S |
| Registered | 2003-08-29 |
| Expires | 2032-08-31 (2143d) |
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 |
|---|---|
| f5-networking.dk | CURANET A/S |
| f5-update.dk | CURANET A/S |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-30 10:21:49 | 1132ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-30 09:27:16 | 969ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-28 12:06:57 | 3240ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-27 11:50:56 shown | 2369ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-09 10:23:59 | 2116ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-30 04:37:58 | 3977ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-29 00:04:14 | 2434ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-08 16:50:21 | 11314ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-07-29 12:12:36 | 4450ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-07-25 04:07:06 | 17875ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-07-11 23:29:16 | 2275ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-07-06 07:40:05 | 2861ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-07-03 11:41:40 | 2043ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-06-27 10:32:23 | 1688ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-06-17 09:10:23 | 2419ms | 2 NS 2 A 2 MX | 🔓 Insecure |