csonline.dk is a .dk domain served by 2 nameservers (amanda.ns.cloudflare.com, logan.ns.cloudflare.com). It was registered on 15 August 2018 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.18.22.64 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 |
|---|---|---|---|---|---|---|---|
| 104.18.22.64 | 300s | — | AS13335 | Cloudflare, Inc. | 104.16.0.0/14 | — | — |
| 104.18.23.64 | 300s | — | AS13335 | Cloudflare, Inc. | 104.16.0.0/14 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700::6812:1640 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:0:0:0:0:0:0/43 | 🇺🇸 United States | — |
| 2606:4700::6812:1740 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:0:0:0:0:0:0/43 | 🇺🇸 United States | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.18.22.64,104.18.23.64 ech=AEX+DQBBawAgACDJvEjY2YYZiFgx5WY8c1cWKMRl2Qiq3+TDqSKWiV3LPAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700::6812:1640,2606:4700::6812:1740 |
| TXT Record |
|---|
| MS=ms87175346 |
| v=spf1 include:_spf.centerasecurity.dk include:amazonses.com include:spf.protection.outlook.com -all |
| Policy | Record (csonline.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf.centerasecurity.dk include:amazonses.com include:spf.protection.outlook.com -all |
| Policy | Record (_dmarc.csonline.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; rua=mailto:640aea3defeb3@dmarc.centerasecurity.com; |
| www | 104.18.22.64 104.18.23.64 2606:4700::6812:1640 2606:4700::6812:1740 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network csonline.dk: 104.18.22.64 104.18.23.64 2606:4700::6812:1640 2606:4700::6812:1740 (AS13335) www.csonline.dk: 104.18.22.64 104.18.23.64 2606:4700::6812:1640 2606:4700::6812:1740 (AS13335) |
| Wildcard | No |
| Selector | CNAME | Key |
|---|---|---|
| s1 | s1.domainkey.u47778511.wl012.sendgrid.net | RSA · ~2048 bit |
| s2 | s2.domainkey.u47778511.wl012.sendgrid.net | 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: 3/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx1-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | D4C349E7B72F5CF4A9CEA358F98947C2… |
| SMTP _25._tcp.mx1-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | 56315B43B892E9AEE184919EC6A5821C… |
| 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 | 56315B43B892E9AEE184919EC6A5821C… |
| SMTP _25._tcp.mx3-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | D4C349E7B72F5CF4A9CEA358F98947C2… |
| 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 | 2417386466 |
| 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 | 2018-08-15 |
| Expires | 2027-08-31 (314d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-14 13:11:52 shown | 805ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-10-01 02:05:30 | 2324ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-09-12 00:37:20 | 2199ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-09-04 12:23:44 | 691ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-08-31 09:56:07 | 767ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-08-27 23:25:25 | 1098ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-08-07 04:40:36 | 1646ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-07-11 22:22:43 | 1568ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-07-08 22:09:54 | 10590ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-06-26 08:23:00 | 2929ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-06-16 23:06:17 | 2762ms | 2 NS 2 A 3 MX | 🔓 Insecure |