flexnu.dk is a .dk domain served by 2 nameservers (byron.ns.cloudflare.com, ursula.ns.cloudflare.com). It was registered on 6 February 2026 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 76.76.21.21 is hosted by Amazon.com, Inc. (AS16509) in United States. Mail is handled by flexnu-dk.mail.protection.outlook.com. 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 |
|---|---|---|---|---|---|---|---|
| 76.76.21.21 | 300s | — | AS16509 | Amazon.com, Inc. | 76.76.21.0/24 | 🇺🇸 United States | Walnut |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 40.104.116.40 |
| TXT Record |
|---|
| google-site-verification=PzEjmQbbU3IQsa9f27GhwC_gN2btLgjcqLGuoJKmz2I |
| MS=ms43221920 |
| v=spf1 include:spf.protection.outlook.com include:amazonses.com include:send.flexnu.dk ~all |
| Policy | Record (flexnu.dk) |
|---|---|
| ~all (soft fail) | v=spf1 include:spf.protection.outlook.com include:amazonses.com include:send.flexnu.dk ~all |
| Policy | Record (_dmarc.flexnu.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; |
| Flags | Tag | Value |
|---|---|---|
| 0 | iodef | mailto:aa@keyton.dk |
| 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 CNAME | 989151ff894d6797.vercel-dns-016.com (all on vercel-dns-016.com) |
| www vs bare domain | Different networks flexnu.dk: 104.26.10.10 104.26.11.10 172.67.69.17 2606:4700:20::681a:a0a (AS13335) (all like this)www.flexnu.dk: 216.150.1.1 216.150.16.1 (AS16509) |
| 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 |
|---|---|---|
| selector1 | selector1-flexnu-dk._domainkey.keytondk.a-v1.dkim.mail.microsoft | RSA · ~2048 bit |
| selector2 | selector2-flexnu-dk._domainkey.keytondk.a-v1.dkim.mail.microsoft | 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: 4/10 · 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 | 2408399495 |
| Primary NS (MNAME) | byron.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | ONE.COM A/S |
| Registered | 2026-02-06 |
| Expires | 2027-02-05 (109d) |
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 |
|---|---|
| findtilladelser.dk | ONE.COM A/S |
| ymg.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-15 10:48:10 | 1376ms | 2 NS 3 A 1 MX | 🔓 Insecure |
| 2026-10-05 23:19:30 | 1585ms | 2 NS 3 A 1 MX | 🔓 Insecure |
| 2026-09-23 19:53:12 | 1834ms | 2 NS 3 A 1 MX | 🔓 Insecure |
| 2026-09-18 14:33:30 | 1968ms | 2 NS 3 A 1 MX | 🔓 Insecure |
| 2026-09-15 01:18:33 | 2191ms | 2 NS 3 A 1 MX | 🔓 Insecure |
| 2026-09-12 12:00:11 | 11300ms | 2 NS 3 A 1 MX | 🔓 Insecure |
| 2026-08-28 07:33:54 | 1284ms | 2 NS 3 A 1 MX | 🔓 Insecure |
| 2026-08-27 15:55:40 | 1166ms | 2 NS 3 A 1 MX | 🔓 Insecure |
| 2026-08-26 14:36:00 | 1604ms | 2 NS 3 A 1 MX | 🔓 Insecure |
| 2026-08-14 01:08:38 | 7627ms | 2 NS 3 A 1 MX | 🔓 Insecure |
| 2026-08-07 13:03:23 | 3458ms | 2 NS 3 A 1 MX | 🔓 Insecure |
| 2026-07-31 14:37:14 | 17417ms | 2 NS 3 A 1 MX | 🔓 Insecure |
| 2026-07-18 10:31:17 | 9798ms | 2 NS 3 A 1 MX | ❓ Unknown |
| 2026-07-13 22:19:09 | 10470ms | 2 NS 3 A 1 MX | 🔓 Insecure |
| 2026-07-08 16:42:51 | 3712ms | 2 NS 3 A 1 MX | 🔓 Insecure |
| 2026-07-06 13:33:20 | 7536ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-07-01 21:55:44 shown | 5390ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-27 11:25:26 | 1307ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-25 17:47:29 | 966ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-17 09:25:50 | 1070ms | 2 NS 1 A 1 MX | 🔓 Insecure |