Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
bukvicka.org
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-14 01:45:11 UTC · ↺ Refresh
MX Hostnames
- app3.c0re.cz
- bmx.cz.net
MX Priorities
- bmx.cz.net: 30
- app3.c0re.cz: 0
A / AAAA Records
No A/AAAA records found.
Mail Server IPs
- 193.85.201.247 ↩ mailx.nextra.cz
- 194.31.191.196 ↩ client-194-31-191-196.net.netcore.services
SOA Record
Raw SOA
ns1.c0re.cz root.c0re.cz 2025121503 604800 86400 2419200 604800
Primary NS (mname)
ns1.c0re.cz
Admin Email (rname)
root@c0re.cz
Serial
2025121503
Refresh
604800s
Retry
86400s
Expire
2419200s
Minimum TTL
604800s
Nameservers (NS)
ns2.gts.cz
ns1.c0re.cz
SPF Record
✓ Strict (-all)
v=spf1 mx ip4:194.31.191.196 ip4:194.31.191.198 ip4:193.8.86.202 a:app3.c0re.cz a:app4.c0re.cz a:sed-gw3.c0re.cz -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; rua=mailto:[email protected]
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 1 found
default._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: default
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
1 record- SPFv=spf1 mx ip4:194.31.191.196 ip4:194.31.191.198 ip4:193.8.86.202 a:app3.c0re.cz a:app4.c0re.cz a:sed-gw3.c0re.cz -all
Full email verification for bukvicka.org
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
SPF / DKIM / DMARC Get 1,000 Free Credits