csdk.dk is a .dk domain served by 2 nameservers (amanda.ns.cloudflare.com, logan.ns.cloudflare.com). It was registered on 16 September 2016 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.26.4.32 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mx1-dk.centerasecurity.dk, mx2-dk.centerasecurity.dk and 1 more. The zone is not DNSSEC-signed, 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 |
|---|---|---|---|---|---|---|---|
| 104.26.4.32 | 300s | — | AS13335 | Cloudflare, Inc. | 104.26.0.0/20 | — | — |
| 104.26.5.32 | 300s | — | AS13335 | Cloudflare, Inc. | 104.26.0.0/20 | — | — |
| 172.67.70.128 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.64.0/18 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:20::681a:420 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:0:0:0:0:0:0/41 | — | — |
| 2606:4700:20::681a:520 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:0:0:0:0:0:0/41 | — | — |
| 2606:4700:20::ac43:4680 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:0:0:0:0:0:0/41 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.26.4.32,104.26.5.32,172.67.70.128 ech=AEX+DQBBEAAgACCXGxdQTSe94cpHhbLtpwWbCkVGSKQ5XRJJ/nLxjKWXHQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:20::681a:420,2606:4700:20::681a:520,2606:4700:20::ac43:4680 |
| TXT Record |
|---|
| v=spf1 include:_spf.centerasecurity.dk include:spf.protection.outlook.com -all |
| Policy | Record (csdk.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf.centerasecurity.dk include:spf.protection.outlook.com -all |
| Policy | Record (_dmarc.csdk.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; rua=mailto:640aea3defeb3@dmarc.centerasecurity.com; |
| www | 104.26.4.32 104.26.5.32 172.67.70.128 2606:4700:20::681a:420 2606:4700:20::681a:520 2606:4700:20::ac43:4680 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network csdk.dk: 104.26.4.32 104.26.5.32 172.67.70.128 2606:4700:20::681a:420 (AS13335) www.csdk.dk: 104.26.4.32 104.26.5.32 172.67.70.128 2606:4700:20::681a:420 (AS13335) |
| Wildcard | No |
DNS lookups: 2/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx1-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | 56315B43B892E9AEE184919EC6A5821C… |
| SMTP _25._tcp.mx1-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | D4C349E7B72F5CF4A9CEA358F98947C2… |
| SMTP _25._tcp.mx2-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | 56315B43B892E9AEE184919EC6A5821C… |
| SMTP _25._tcp.mx2-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | D4C349E7B72F5CF4A9CEA358F98947C2… |
| SMTP _25._tcp.mx3-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | D4C349E7B72F5CF4A9CEA358F98947C2… |
| SMTP _25._tcp.mx3-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | 56315B43B892E9AEE184919EC6A5821C… |
| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2417605165 |
| Primary NS (MNAME) | amanda.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 | 2016-09-16 |
| Expires | 2027-09-30 (348d) |
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).
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-16 17:30:33 shown | 2280ms | 2 NS 3 A 3 MX | 🔓 Insecure |
| 2026-10-10 03:33:37 | 2711ms | 2 NS 3 A 3 MX | 🔓 Insecure |
| 2026-08-26 17:04:44 | 1232ms | 2 NS 3 A 3 MX | 🔓 Insecure |
| 2026-08-18 12:28:35 | 5768ms | 2 NS 3 A 3 MX | 🔓 Insecure |
| 2026-08-11 10:16:49 | 8781ms | 2 NS 3 A 3 MX | 🔓 Insecure |
| 2026-06-21 16:28:15 | 1207ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-06-21 13:50:19 | 944ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-20 17:32:27 | 877ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-06-16 23:05:20 | 1070ms | 2 NS 2 A 3 MX | 🔓 Insecure |