The Blacklist Lookup tool is a free online service that checks whether your IP address or domain name is listed on any major email blacklists, DNS-based blocking lists (DNSBLs) or web reputation databases. Being blacklisted can severely damage your email deliverability and website reputation.

This tool queries multiple real-time blacklist databases simultaneously and returns a comprehensive report showing which lists, if any, have flagged your IP or domain. It is an essential diagnostic tool for email administrators, web hosts and webmasters.

How to Use the Blacklist Lookup

• Enter your IP address or domain name in the input field
• Click Check Blacklist
• Review results across all checked databases
• For any hits, follow the delisting instructions for that specific list

Common Reasons for Blacklisting

• Sending spam emails (knowingly or via a compromised account)
• Hosting malware, phishing pages or spammy content
• Abuse reports from recipients
• Shared hosting where another tenant triggered the listing

What to Do If Listed

Most blacklists have a self-service delisting request process. Fix the underlying issue first, then submit a removal request. Check again after 24–48 hours to confirm removal. This tool is completely free — no login required.