zero-day.dk is a .dk domain served by 2 nameservers (alan.ns.cloudflare.com, emma.ns.cloudflare.com). It was registered on 18 October 2023 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.58.32 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mx1.gigahost.dk, mx2.gigahost.dk and 1 more. The zone is DNSSEC-signed and validates, has no 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 |
|---|---|---|---|---|---|---|---|
| 104.21.58.32 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.199.121 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 300s | mx1.gigahost.dk | 46.183.139.11 | mx1.gigahost.dk | AS47292 Sentia Denmark A/S |
| 10 | 300s | mx2.gigahost.dk | 46.183.139.12 | mx2.gigahost.dk | AS47292 Sentia Denmark A/S |
| 10 | 300s | mx3.gigahost.dk | 46.183.139.13 | mx3.gigahost.dk | AS47292 Sentia Denmark A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 172.67.199.121 |
| 🔶 Autoconfig | 104.21.58.32 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3036::ac43:c779 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::6815:3a20 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.58.32,172.67.199.121 ech=AEX+DQBBJgAgACBS20qKQr2J9ago8oYiexT1lzyRIbfVKwCw+cFB+9/GOQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3036::ac43:c779,2606:4700:3037::6815:3a20 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 10 | 10 | 443 | autodiscover.gigahost.dk |
| www | 104.21.58.32 172.67.199.121 2606:4700:3036::ac43:c779 2606:4700:3037::6815:3a20 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network zero-day.dk: 104.21.58.32 172.67.199.121 2606:4700:3036::ac43:c779 2606:4700:3037::6815:3a20 (AS13335) www.zero-day.dk: 104.21.58.32 172.67.199.121 2606:4700:3036::ac43:c779 2606:4700:3037::6815:3a20 (AS13335) |
| Wildcard | Yes: any name under the zone resolves |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2416497933 |
| Primary NS (MNAME) | alan.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2023-10-18 |
| Expires | 2035-10-17 (3287d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-04 05:54:26 shown | 2168ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-10-01 05:37:36 | 654ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-25 01:02:21 | 689ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-23 17:48:51 | 737ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-10 04:44:50 | 907ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-29 21:30:20 | 2324ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-27 22:30:14 | 2701ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-16 14:22:16 | 2990ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-07-24 02:20:34 | 1024ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-07-21 18:36:13 | 1104ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-29 13:16:47 | 1649ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-25 13:28:41 | 755ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-25 02:18:14 | 925ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-18 03:23:58 | 1257ms | 2 NS 2 A 3 MX | 🔒 Secure |