Check if an IPv4 address appears on major DNS blacklists (DNSBLs) used by email servers and firewalls worldwide.
DNS Blacklists (DNSBLs) are real-time databases of IP addresses associated with spam, malware distribution, phishing, and other abusive activity. Mail servers and security systems query these lists to decide whether to accept or reject connections from a given IP.
Being listed can cause email delivery failures, connection rejections, and reputation damage. This tool checks your IP against 12 widely-used blacklists simultaneously, including Spamhaus, SORBS, Barracuda, and others. If your IP is listed, visit each blacklist operator's website and follow their delisting procedure after resolving the underlying issue.
Spamhaus SBL, Spamhaus XBL, Spamhaus PBL, SORBS SPAM, SORBS DUL, Barracuda BRBL, SpamCop, URIBL Black, Abusix Mail Intelligence, s5h.net, SpamRATS, MX Toolbox