Blacklist Lookup
Check if an IP address appears on major DNS blacklists including Spamhaus, Barracuda, SpamCop, SORBS and CBL.
Free Blacklist Lookup — Check IP & Domain Blacklists
If your IP address or domain is on a spam blacklist, your emails may not reach recipients, your website could be flagged in browsers, and your sender reputation suffers. This free Blacklist Lookup checks any IP address or domain against major DNSBL (DNS-Based Blackhole List) providers including Spamhaus, Barracuda, SpamCop, SORBS, and others in seconds.
Enter an IP address or domain to check its status across multiple blacklists simultaneously. The tool returns a clear pass/fail for each blacklist, helping you quickly identify which specific list has flagged you so you can begin the delisting process.
Businesses sending transactional emails, newsletters, or any server-to-server communication should check their sending IP regularly. A single blacklisting can cause significant email deliverability problems overnight.
Major Blacklists Checked
Spamhaus. One of the most widely used anti-spam organizations. Their SBL, XBL, and DBL lists are respected by virtually every major email provider.
Barracuda. Used by Barracuda email security appliances worldwide. Being listed blocks email delivery to businesses using Barracuda filters.
SpamCop. A real-time blacklist based on user spam reports. IPs are listed for a limited time based on recent spam reports.
SORBS. The Spam and Open Relay Blocking System maintains lists of open relays, spam sources, and exploited servers.
How to Get Delisted
Fix the root cause first. Before requesting delisting, resolve whatever caused the listing — secure a compromised account, stop spam campaigns, patch the open relay, or clean malware.
Submit a delisting request. Each blacklist has its own delisting process and URL. After fixing the issue, submit a request and explain what you have done.
Monitor regularly. After delisting, continue monitoring your sending IP to catch any future listings quickly. New listings can occur within hours of a security incident.
Related Tools
- Google Malware Checker – Check if Google has flagged your site for malware.
- Domain Hosting Checker – Find IP and hosting details for any domain.
- Reverse IP Checker – Find all domains sharing your IP.
Frequently Asked Questions
What is a DNS blacklist?
A database of spam-sending or malicious IPs/domains that email servers query to filter incoming mail.
How do I get delisted?
Fix the root cause, then submit a delisting request to each specific blacklist provider.
Does it affect SEO?
Email blacklists don't directly affect rankings, but web threat lists (like Google Safe Browsing) can block your site in browsers.
Is this free?
Yes. Completely free, no account needed.