Check if an IP or domain is listed on email blacklists.
What is Blacklist Checker?
Blacklist Checker tests whether an IP address appears on major email blacklists (DNSBLs). A blacklisted IP means your emails are being rejected or sent to spam. Check regularly if you run your own mail server or send bulk email.
How to use this tool
Enter an IP address to check.
The tool queries multiple DNSBL databases.
See which blacklists list your IP and which don't.
If listed, follow the blacklist's removal process.
Check regularly to catch issues before they affect delivery.
Frequently asked questions
What is a blacklist/DNSBL?
A database of IP addresses known to send spam. Email servers query these lists to decide whether to accept, reject, or spam-filter incoming mail. Major lists include Spamhaus, Barracuda, and SORBS.
Why is my IP blacklisted?
Common reasons: your server sent spam (possibly from a compromised account), you're on shared hosting with a spamming neighbor, or a previous owner of the IP was a spammer. Some lists are aggressive and list entire IP ranges.
How do I get delisted?
Each blacklist has its own removal process. Spamhaus requires you to fix the issue and request removal. Some lists remove automatically after the spam stops. Check each listing's removal instructions.
Should I monitor my IP regularly?
Yes, if you send business email or newsletters. Set up monitoring to alert you when your IP gets listed. Catching it early means fixing it before customers notice delivery problems.