u27.dk is a .dk domain served by 2 nameservers (ns.brisson.dk, ns2.brisson.dk). It was registered on 17 August 2026 (WHOIS) and first appeared in the .dk zone on 18 August 2026. Mail is handled by mx.brisson.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 our latest scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns.brisson.dk | 80.209.68.5 | 80.209.68.5.static.fibianet.dk | AS44869 FIBIA P/S |
| ns2.brisson.dk | 80.209.68.3 | 80.209.68.3.static.fibianet.dk | AS44869 FIBIA P/S |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 86400s | mx.brisson.dk | 80.209.68.5 | 80.209.68.5.static.fibianet.dk | AS44869 FIBIA P/S |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _imaps._tcp | 0 | 0 | 993 | mail.u27.dk |
| TXT Record |
|---|
| v=spf1 mx include:_spf.brisson.dk -all |
| Policy | Record (u27.dk) |
|---|---|
| -all (hard fail) | v=spf1 mx include:_spf.brisson.dk -all |
| Policy | Record (_dmarc.u27.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:dmarc-reports@lists.e11.dk; ruf=mailto:dmarc-forensic@lists.e11.dk |
| Check | Result |
|---|---|
| Status | 🧪 Testing |
| TXT record (_mta-sts) | ✓ Found |
| HTTPS policy | ✓ Valid |
| Mode | testing |
| Policy ID | 20260904144925Z |
| max_age | 86400s |
| Policy MX | mx.brisson.dk |
| Status | Report address (rua) |
|---|---|
| ✓ Enabled | mailto:tlsrpt-reports@lists.e11.dk |
| www | NXDOMAIN |
| www vs bare domain | Neither resolves u27.dk: no address www.u27.dk: no address |
| Wildcard | No |
| Denial of existence | NSEC zone can be walked (all names enumerable) |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| default | — | 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: 2/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx.brisson.dk | DANE-EE · SPKI · SHA-256 | FA203DECA691B5F6574B2C65ED8634B1… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | resolution failed: ncache nxrrset |
| Field | Value |
|---|---|
| Serial | 2026101602 |
| Primary NS (MNAME) | ns.brisson.dk |
| Responsible (RNAME) | hostmaster@brisson.dk |
| Refresh | 86400s |
| Retry | 7200s |
| Expire | 2419200s |
| Minimum (neg-cache TTL) | 300s |
| Field | Value |
|---|---|
| Registrar | Simply.com A/S |
| Registered | 2026-08-17 |
| Expires | 2027-08-16 (302d) |
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 |
|---|---|
| v37.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-16 22:55:43 shown | 610ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-10-12 15:13:47 | 846ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-10-11 14:24:48 | 1701ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-10-09 07:26:05 | 2870ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-10-08 07:21:52 | 702ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-10-04 05:21:26 | 678ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-10-03 05:20:06 | 1659ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-10-02 05:16:44 | 731ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-30 04:59:28 | 1032ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-28 23:16:48 | 595ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-27 22:47:45 | 766ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-24 16:02:29 | 674ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-23 14:46:30 | 643ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-22 02:04:48 | 606ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-20 18:40:40 | 1010ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-13 17:01:06 | 2709ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-12 10:43:51 | 915ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-05 09:53:49 | 535ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-08-27 19:38:51 | 428ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-08-26 18:33:46 | 747ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-08-26 07:09:42 | 735ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-08-23 19:17:08 | 864ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-08-22 13:57:16 | 929ms | 2 NS 0 A 1 MX | 🔓 Insecure |
| 2026-08-18 08:39:01 | 4210ms | 3 NS 0 A 0 MX | 🔒 Secure |