Free Blacklist Checker
Instantly check if your IP or domain is on email blacklists.
What is a Blacklist Checker?
A blacklist checker (also called a blocklist checker or DNSBL checker) is a tool that scans major email blacklist databases to see if your IP address or domain has been flagged as a source of spam. Email blacklists are used by mail servers worldwide to filter out unwanted messages and protect users from spam, phishing, and malware.
Understanding results
Clean
Your IP is not listed on any major blacklists. Safe to send.
Blacklisted
Your IP was found on one or more blacklists. Deliverability issues likely.
Error
Could not verify the status. Please try again or check the format.
Why check your IP reputation?
Email Deliverability
If your IP is blacklisted, your emails may never reach your recipients' inboxes. They'll bounce or go straight to spam.
Sender Reputation
Your IP's reputation directly affects your email marketing success. Regular monitoring helps you maintain a clean sending record.
Reduce Bounce Rates
High bounce rates can trigger blacklisting. Monitoring and cleaning your lists helps prevent this cycle.
Better ROI
Ensure your marketing budget isn't wasted on emails that will never be delivered due to IP blocks.
Major Blacklists We Check
Spamhaus SBL
The Spamhaus Block List, tracking verified spam sources
Spamhaus XBL
Exploits Block List for hijacked PCs and compromised servers
Spamhaus PBL
Policy Block List for dynamic IP ranges
Spamhaus CSS
CSS blocklist for known spam operations
Need to verify email addresses?
Unlimited Verifier helps you clean your email lists before sending. Verify millions of emails and protect your sender reputation.