port53.dk is a .dk domain served by 7 nameservers (ns21.cloudns.net, ns23.cloudns.net, ns24.cloudns.net and 4 more). It was registered on 2 November 2016 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.107.169.23 is hosted by BornFiber Service Provider ApS (AS24800) in Denmark. Mail is handled by mailforward21.cloudns.net, mailforward22.cloudns.net. The zone is DNSSEC-signed and validates, publishes a DMARC policy and is reachable over IPv6. 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 185.107.169.23 | 3600s | bornmesh.dk | AS24800 | BornFiber Service Provider ApS | 185.107.168.0/22 | 🇩🇰 Denmark | Rønne |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2a00:4820:3f60:f00:9b03:9cf8:73f2:a355 | 3600s | mx.szn.dk | AS24800 | BornFiber Service Provider ApS | 2a00:4820:0:0:0:0:0:0/32 | 🇩🇰 Denmark | Rønne |
| Priority | Target | SvcParams |
|---|---|---|
| 10 service | . | alpn="h3,h2" |
| TXT Record |
|---|
| Port 53 |
| v=spf1 include:_spf.szn.dk -all |
| Policy | Record (port53.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf.szn.dk -all |
| Policy | Record (_dmarc.port53.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:dmarc@port53.dk |
| Flags | Tag | Value |
|---|---|---|
| 0 | iodef | mailto:klaus@seistrup.dk |
| 0 | issue | letsencrypt.org |
| 0 | issue | zerossl.com |
| www | 185.107.169.23 2a00:4820:3f60:f00:a7bd:a4c:8f39:12aa (AS24800) (address records, no CNAME) |
| www vs bare domain | Same network port53.dk: 185.107.169.23 2a00:4820:3f60:f00:9b03:9cf8:73f2:a355 (AS24800) www.port53.dk: 185.107.169.23 2a00:4820:3f60:f00:a7bd:a4c:8f39:12aa (AS24800) |
| Wildcard | No |
| Denial of existence | NSEC3 · 0 iterations · no salt · opt-out RFC 9276 ✓ |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 5/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| HTTPS _443._tcp.port53.dk | DANE-EE · SPKI · SHA-256 | FC0C32BCA3D97FB2B22C3AECD6B878E4… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026101901 |
| Primary NS (MNAME) | ns21.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 | 2016-11-02 |
| Expires | 2027-08-31 (311d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-19 16:35:12 shown | 7937ms | 7 NS 1 A 2 MX | 🔒 Secure |
| 2026-10-03 17:55:59 | 980ms | 7 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-29 17:58:51 | 6106ms | 7 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-13 08:53:41 | 8736ms | 7 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-03 21:00:19 | 9862ms | 7 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-03 13:07:36 | 6411ms | 7 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-20 13:18:47 | 10502ms | 7 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-01 22:55:27 | 17713ms | 7 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-14 21:56:19 | 15889ms | 7 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-22 05:06:26 | 2111ms | 7 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-17 13:11:00 | 1737ms | 7 NS 1 A 2 MX | 🔒 Secure |