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

Detect domains flagged for malware, phishing, and abuse across public threat feeds

Active Blocklists & Threat Intelligence Sources

What We Check

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Public Blocklists

Spam and email blocklists
Malware distribution domains
Phishing site databases
Known malicious domains

Threat Intelligence

Malware and phishing feeds
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

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.

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.

This is one check. A full scan runs them all.

Free

The Blocklist Checker covers one area. A full scan runs every check on the same site in one go, so nothing it does not reach goes unnoticed.

Covered by this check

Multiple public blocklist checks
External resource domain checking
Spam and malware detection

Added by a full scan

SSL/TLS certificate validation
Security headers analysis
WordPress vulnerability scanning
DNS security (DNSSEC, CAA)
Web misconfiguration check
Card skimming detection
Certificate transparency logs
And 6+ more security checks

Want it checked automatically? A free account rescans one site every week and emails you new findings. No credit card.

Start free monitoring

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