Blacklist Checker
Free IP Blacklist Checker
Check a domain's resolved IP addresses against Spamhaus, SpamCop, Barracuda, SORBS and CBL — the major public DNS blocklists — live.
Blacklist Checker
Check a domain's IP addresses against major public DNS blocklists.
Enter a domain above to run a real, live check.
Capabilities
What it checks
5 blocklists
Spamhaus ZEN, SpamCop, Barracuda, SORBS and the Composite Blocking List.
Every resolved IP
Checks each A record the domain resolves to, not just the first.
Clear status
Listed, clean, or inconclusive when a list can't be queried publicly.
Why use it
Benefits
- Diagnose why outbound mail or traffic from a domain is being rejected or flagged.
- Verify a delisting request actually took effect.
- Export results as JSON for an incident report.
FAQ
Frequently Asked Questions
Spamhaus, SpamCop, Barracuda, SORBS and the Composite Blocking List — major public DNS-based blocklists.