Domain Overview
DNS: ✓ 20d ago
Checker: ✓ 20d ago
cbox.cz
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-05-21 01:12:38 UTC · ↺ Refresh
MX Hostnames
- centrum-cz-20mx2.eco-mx.cz
- centrum-cz-10mx1.eco-mx.cz
- centrum-cz-20mx1.eco-mx.cz
- centrum-cz-10mx2.eco-mx.cz
MX Priorities
- centrum-cz-20mx1.eco-mx.cz: 20
- centrum-cz-20mx2.eco-mx.cz: 20
- centrum-cz-10mx1.eco-mx.cz: 10
- centrum-cz-10mx2.eco-mx.cz: 10
A / AAAA Records
- 46.255.231.129 ↩ centrum.cz
- 2a00:da80:e::129 ↩ centrum.cz
Mail Server IPs
- 46.255.227.8 (no PTR)
- 46.255.225.8 (no PTR)
SOA Record
Raw SOA
ns1.centrum.cz domain.centrumholdings.com 2024121601 28800 7200 1209600 3600
Primary NS (mname)
ns1.centrum.cz
Admin Email (rname)
domain@centrumholdings.com
Serial
2024121601
Refresh
28800s
Retry
7200s
Expire
1209600s
Minimum TTL
3600s
Nameservers (NS)
ns3.eint.cz
ns1.centrum.cz
ns2.eco-dns.net
SPF Record
✓ Soft Fail (~all)
v=spf1 redirect=_spf.centrum.cz
📊 DNS lookups: 1/10
DMARC Record
✗ p=none
v=DMARC1; p=none; rua=mailto:[email protected]; ruf=mailto:[email protected]
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 1 found
mail._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: mail
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
1 record- SPFv=spf1 redirect=_spf.centrum.cz
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