Enter a URL
The Blacklist Lookup tool is a free and essential service that checks whether your domain or IP address is listed on common blacklists such as DNSBLs (Domain Name System Blackhole Lists), SURBLs (Spam URI Real-time Blocklists), and other spam and security databases.
This tool helps you identify if your website or email server has been flagged as suspicious or spammy — which can negatively affect email deliverability, SEO rankings, and brand credibility.
Key Features:
Scans major DNS-based blacklists (e.g., Spamhaus, SORBS, Barracuda)
Supports both IP address and domain lookups
Instantly shows blacklist status and details
Useful for diagnosing email delivery problems and domain trust issues
No technical setup or sign-up required
Perfect for marketers, sysadmins, webmasters, and business owners who want to maintain a clean online reputation.