surdej.dk is a .dk domain served by 4 nameservers (pns21.cloudns.net, pns22.cloudns.net, pns23.cloudns.net and 1 more). It was registered on 5 June 2006 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Mail is handled by mx.szn.dk, benji.szn.dk. The zone is DNSSEC-signed and validates, has no 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.
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | mx.szn.dk | 185.107.169.23 2a00:4820:3f60:f00:9b03:9cf8:73f2:a355 |
bornmesh.dk — |
AS24800 BornFiber Service Provider ApS AS24800 BornFiber Service Provider ApS |
| 20 | 3600s | benji.szn.dk | 2a01:7e01::f03c:91ff:fe2c:3d7d | benji.szn.dk | AS63949 Akamai Connected Cloud |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2a00:4820:31b0:0:dacb:8aff:feba:55d7 | 3600s | — | AS24800 | BornFiber Service Provider ApS | 2a00:4820:0:0:0:0:0:0/32 | 🇩🇰 Denmark | Rønne |
| TXT Record |
|---|
| v=spf1 a mx include:_spf.szn.dk -all |
| Policy | Record (surdej.dk) |
|---|---|
| -all (hard fail) | v=spf1 a mx include:_spf.szn.dk -all |
| Flags | Tag | Value |
|---|---|---|
| 0 | iodef | mailto:klaus@seistrup.dk |
| 0 | issue | letsencrypt.org |
| www | 185.107.169.23 2a00:4820:31b0:0:dacb:8aff:feba:55d7 (AS24800) (address records, no CNAME) |
| www vs bare domain | Same network surdej.dk: 185.107.169.23 2a00:4820:31b0:0:dacb:8aff:feba:55d7 (AS24800) www.surdej.dk: 185.107.169.23 2a00:4820:31b0:0:dacb:8aff:feba:55d7 (AS24800) |
| Wildcard | No |
| Denial of existence | NSEC3 · 0 iterations · no salt · opt-out RFC 9276 ✓ |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 7/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.benji.szn.dk | DANE-EE · SPKI · SHA-256 | 1B2B1DF9F76C32059F13CCE35276AE83… |
| SMTP _25._tcp.mx.szn.dk | DANE-EE · SPKI · SHA-256 | AB1AE6252E2062155EAF1C927AF60B8B… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026062601 |
| Primary NS (MNAME) | pns21.cloudns.net |
| Responsible (RNAME) | kas@port53.dk |
| Refresh | 7200s |
| Retry | 1800s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2006-06-05 |
| Expires | 2027-04-30 (191d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-04 13:33:30 | 16265ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-15 23:30:27 | 4923ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-27 16:31:11 | 1824ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-26 02:02:23 | 8266ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-06 06:12:18 | 1566ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-18 01:44:20 | 8125ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-26 14:40:03 shown | 7248ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-06-21 08:35:17 | 2613ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-21 07:05:57 | 1157ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-17 14:33:29 | 5984ms | 4 NS 1 A 2 MX | 🔒 Secure |