Blacklist Checker
Check if your IP address or domain is listed on 50+ spam blacklists and DNSBL databases.
How to use the Blacklist Checker
Check if your IP address or domain is listed on 50+ spam blacklists and DNSBL databases. Enter the domain, hostname, IP address, selector, or record value requested by the tool, then run the check to see the current public configuration. Use the result to confirm whether the domain is resolving correctly, whether email authentication is aligned, or whether a visible trust issue needs follow-up.
Enter the domain or value you want to inspect.
Review the returned records, warnings, and status signals.
Fix the DNS, hosting, SSL, or email setting, then retest.
What to check next
A single lookup rarely tells the whole story. For production websites, verify DNS, SSL, email authentication, blacklist status, and public security headers together before making a launch, migration, or deliverability decision. Common next checks after this page include DMARC Checker, SPF Checker, Reverse IP.
Blacklist Checker FAQ
What does the Blacklist Checker check?
Check if your IP address or domain is listed on 50+ spam blacklists and DNSBL databases.
Is the Blacklist Checker free to use?
Yes. The basic blacklist checker is free and does not require a login. Paid Hostao reports and fix plans are available when you need analyst review or managed remediation.
When should I run the Blacklist Checker?
Run it before DNS changes, email sender changes, hosting migration, SSL renewal, launch checks, or whenever a website, domain, or email delivery issue needs quick verification.