Check IP Reputation
Multiple Blacklists
Check IPs against Spamhaus, Barracuda, SpamCop and UCEPROTECT
IP Range Support
Check entire IP ranges using CIDR notation up to /24 or specific ranges like 192.168.1.2-192.168.1.20
Instant Results
Get real-time reputation data from leading blacklist providers
About IP Blacklist Checking
What are IP blacklists?
IP blacklists (or DNS-based blackhole lists) are databases that list IP addresses known for sending spam, hosting malware, or participating in malicious activities. Email servers and security systems regularly check these lists to filter out potentially harmful content.
Why should I check my IP?
If your IP is listed on blacklists, your emails may be rejected or marked as spam. Regular checking helps you maintain your email deliverability and server reputation, especially important for businesses that rely on email communication.
How do I get delisted?
Each blacklist provider has its own delisting process. Generally, you'll need to identify and fix the issue that got you listed (like a compromised server, open relay, or spam problems), then follow the specific provider's removal request procedure. Most blacklists provide instructions on their websites.
What blacklists are checked?
This tool checks your IP against several major blacklists, including Spamhaus ZEN (combines SBL, XBL, and PBL), Barracuda, SpamCop, and all three levels of UCEPROTECT. These are among the most widely used blacklists for email filtering and security.