Query The Spamhaus Project
Enter an IP address or domain name to execute a direct DNS lookup against the world's most heavily utilized anti-spam filters (ZEN, SBL, XBL, PBL, and DBL).
Real-Time SBL, XBL & PBL Diagnostics
Protect your email deliverability with direct, real-time queries to The Spamhaus Project. We intelligently detect your IPv4 or domain input to execute live, uncached lookups against the ZEN, DBL, SBL, XBL, and PBL databases. Instantly parse specific 127.0.0.x return codes to pinpoint spam gangs, compromised botnets, or ISP policy blocks, enabling immediate and accurate remediation.
Enter an IP address or domain name to execute a direct DNS lookup against the world's most heavily utilized anti-spam filters (ZEN, SBL, XBL, PBL, and DBL).
The Spamhaus Project protects over 3 billion user mailboxes. Being listed on their databases (ZEN or DBL) means your emails will be blocked globally. Scan now to ensure your network is clean.
zen.spamhaus.org composite zone to see if your IP address is flagged as an open relay, a known spammer, or a compromised botnet node.Your feedback has been submitted successfully. We appreciate your help in improving our tools.