Check if an IP or domain appears on major DNS blocklists and get practical steps to fix deliverability issues.
The Blacklist Checker scans over 100 major DNS-based Blackhole Lists (DNSBLs) to see if your IP address or domain is flagged as a source of spam.
Scan 100+ major blocklists simultaneously
Auto-resolve domains to IPs
Check for Spamhaus, Barracuda, and SORBS
Remediation links for delisting
Identify PTR (Reverse DNS) issues
Connect multiple emails, Automate emails, manage replies, and track results all in one inbox.