IP Blacklist Checker
Check if an IP address is listed on spam blacklists
About IP Blacklists
IP blacklists (or DNSBLs - DNS-based Blackhole Lists) are databases that list IP addresses that are known to send spam or malicious traffic.
Email servers, websites, and security systems often check these blacklists to block suspicious traffic.
Common Reasons for Blacklisting
- Sending spam emails
- Hosting malware or phishing content
- Being part of a botnet
- Misconfigured mail servers
- Previous abuse by former users of the IP