Spam Blacklist Check
Check an IP or domain against 20 DNSBL blacklists: Spamhaus, SpamCop, SORBS and more
Blacklist checker tests an IP or domain against 30+ public DNSBLs (Spamhaus, Barracuda, SORBS, SpamCop, UCEPROTECT). Shows which lists the target is on and why. Fast answer to "why does my mail end up in spam".
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Why teams trust us
How it works
Enter domain or IP
Checked against 50+ DNSBL lists
Blacklists & SPF/DMARC result
Email spam check: protect your email deliverability
Being on a spam blacklist critically reduces email deliverability. The tool checks your server against major blacklist databases and provides delisting instructions.
Multi-blacklist check
Simultaneous check against Spamhaus, Barracuda, SURBL, URIBL, Invaluement and other databases.
IP and Domain
Check both the server IP address and the sender domain — both affect deliverability.
Delisting Instructions
For each blacklist we show a direct link to the delisting form and processing timeframes.
Check History
Save check results to track the dynamics of IP reputation over time.
Who uses this
Email marketers
email deliverability
Sysadmins
mail server reputation
Security
IP blacklist check
Developers
SMTP config verification
Common Mistakes
v=spf1 ... -all anyone can send emails from your domain. This is a guaranteed path to blacklisting.Best Practices
Get more with a free account
Spam check history and reputation monitoring for your domain and IP.
Sign up freeDNSBL Blacklist Check — Is Your IP Blacklisted?
DNSBL (DNS-based Blackhole Lists) are real-time spam databases used by mail servers to block unwanted email. Being listed on a blacklist can severely impact your email deliverability and server reputation. Our tool checks your IP or domain against 20 major blacklists including Spamhaus, SpamCop, SORBS, Barracuda Central, and more.
If your IP is listed, use the delisting links provided to request removal from each blacklist. Common reasons for blacklisting include sending spam, running an open relay, or being part of a botnet. After delisting, use our DNS Lookup to verify your server's MX records and SSL Checker to ensure your mail server certificate is valid.
Frequently Asked Questions
What is DNSBL?
DNSBL (DNS-based Blackhole List) is a list of IP addresses reported for spam. We check 20+ such lists.
My IP is on a spam list. What do I do?
Contact the DNSBL owner for delisting. Usually you need to fix the cause (open relay, compromised server) and submit a request.
Related guides
Longer-form reading on this topic from the knowledge base.
Email deliverability monitoring
Alerts on MX / SPF / DKIM / DMARC changes — guard against silent email infrastructure breakage.