Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
ctk.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-24 05:02:43 UTC · ↺ Refresh
MX Hostnames
- ctk-mail01.donotspam.de
- ctk-mail02.donotspam.de
MX Priorities
- ctk-mail02.donotspam.de: 100
- ctk-mail01.donotspam.de: 100
A / AAAA Records
- 142.132.244.173 ↩ static.173.244.132.142.clients.your-server.de
Mail Server IPs
- 212.18.21.84 ↩ ctk-mail02.donotspam.de
- 212.18.1.58 ↩ ctk-mail01.donotspam.de
SOA Record
Raw SOA
hydrogen.ns.hetzner.com dns.hetzner.com 2026031700 86400 10800 3600000 3600
Primary NS (mname)
hydrogen.ns.hetzner.com
Admin Email (rname)
dns@hetzner.com
Serial
2026031700
Refresh
86400s
Retry
10800s
Expire
3600000s
Minimum TTL
3600s
Nameservers (NS)
helium.ns.hetzner.de
hydrogen.ns.hetzner.com
oxygen.ns.hetzner.com
SPF Record
✓ Strict (-all)
v=spf1 a mx ip4:212.111.231.0/27 ip4:212.111.231.224/28 ip4:85.190.183.226/32 ip4:85.190.183.224/32 ip4:85.190.183.225/32 a:mx01.rexx-systems.de include:_spf.donotspam.de -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ MissingNo DMARC record — emails cannot be rejected on auth failure.
DKIM Selectors
✗ None detectedNo DKIM records found for common selectors — your provider may use a custom selector name.
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
4 records- SPFv=spf1 a mx ip4:212.111.231.0/27 ip4:212.111.231.224/28 ip4:85.190.183.226/32 ip4:85.190.183.224/32 ip4:85.190.183.225/32 a:mx01.rexx-systems.de include:_spf.donotspam.de -all
- MS=ms29706687
- apple-domain-verification=dlviS21xUGfrBhR8
- cisco-ci-domain-verification=1eb3fc9ef07bf1e7c06fcb64bd007885d463d9d4b3bdb184767b6d251f199445
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