Free Domain Blocklist Checker
Check if your domain is listed on spam, malware, or phishing blocklists. Protect your reputation and email deliverability.
Multiple Blocklists
Check against dozens of public blocklists covering spam, malware, phishing, and threat intelligence
External Resources Check
Enable browser scan to check all third-party domains your site loads - identifies blocklisted external resources
Threat Intelligence
Integrates VirusTotal, Google Safe Browsing, and Talos Intelligence to detect domains flagged by security vendors
Active Blocklists & Threat Intelligence Sources
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What We Check
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Public Blocklists
- Spam and email blocklists
- Malware distribution domains
- Phishing site databases
- Known malicious domains
Threat Intelligence
- VirusTotal security vendor checks
- Google Safe Browsing status
- Talos Intelligence (Cisco) blocklist
- Community reputation scores
- Historical threat data
Why Blocklist Monitoring Matters
Being listed on blocklists can severely impact your business. Email deliverability drops, browser warnings appear for visitors, and your domain reputation suffers. Regular monitoring helps detect and resolve listings quickly.
Our scanner checks your domain against multiple sources and can optionally scan all external resources loaded by your website to identify compromised third-party services.
- Protect email deliverability and sender reputation
- Avoid browser security warnings for visitors
- Detect compromised third-party scripts and services
- Monitor domain reputation in real-time
Want the Complete Picture?
FREEThis Blocklist Checker is great for a quick check, but our Full Security Scan gives you a comprehensive security audit in one go.
Frequently Asked Questions
What is a blocklist checker?
A blocklist checker scans your domain against multiple security databases to see if it's been flagged for spam, malware, phishing, or other malicious activity. Being on a blocklist can harm your email deliverability and trigger browser warnings for visitors.
How does Google Safe Browsing work?
Google Safe Browsing maintains a constantly updated database of unsafe web resources. When a domain is flagged, Chrome and other browsers display warnings to users. Our tool checks your domain against Google's Safe Browsing API in real-time.
What is VirusTotal and how many sources does it check?
VirusTotal aggregates over 95 security vendors and scanners to analyze domains and URLs. When you scan with our tool, we query VirusTotal to see if any of these vendors have flagged your domain as malicious.
Why is my domain on a blocklist?
Common reasons include: compromised website sending spam, malware infections, phishing content, excessive email sending patterns, or third-party scripts on your site that are malicious. Sometimes legitimate sites get listed due to false positives.
How do I get removed from a blocklist?
First, fix the underlying issue (remove malware, stop spam, etc.). Then submit a delisting request to each blocklist provider. Most have online forms. Some delist automatically after a period of clean behavior. Response times vary from hours to weeks.
How often should I check my domain?
For active websites, weekly or monthly checks are recommended. If you notice email deliverability issues or receive reports of browser warnings, check immediately. Sites handling sensitive data should monitor more frequently.
Does this check affect my domain reputation?
No. Checking your domain against blocklists is a read-only operation and does not affect your reputation. We simply query existing databases - we don't report or submit domains to any lists.