What Is an IP Blacklist Check?
An IP blacklist check tells you whether an IP address or domain appears on common spam and abuse blocklists. Being listed can cause email delivery failures, CAPTCHA challenges, or rejected requests. Checking reputation helps you diagnose issues and decide whether to remediate, delist, or change infrastructure.
How to use this IP Blacklist Checker
- Enter an IP address or domain.
- Click Check Blacklist.
- Review whether the target is listed and which databases report it.
Blacklist Databases
Frequently Asked Questions
What is an IP Blacklist?
An IP blacklist is a list of IP addresses or domains flagged for sending spam or malicious content.
How can I use this IP Blacklist Checker?
Enter an IP address or domain to check if it is listed in the top 10 major blacklist databases.
Is this tool free?
Yes, this tool is completely free and works for any IP or domain.
Which databases are checked?
Spamhaus, SORBS, Barracuda, SpamCop, Invaluement, UCEPROTECT, DNSBL.info, PSBL, NJABL, RBL.