Find out in seconds whether an IP address or domain appears on any major email or web blacklists. Our blocklist checker queries dozens of real-time blackhole lists (RBLs) and returns a clear pass or fail result.
Being listed on a blacklist can devastate your email deliverability overnight. Regular blocklist checks are a simple habit that helps you catch and resolve listing issues before they start affecting real recipients.
Receiving suspicious emails or traffic from an unknown domain? Run a blocklist check to see whether that IP or domain has been flagged by spam databases, helping you make informed decisions about whether to trust it.
FAQS
What is a blocklist or email blacklist?
A blocklist (also called a blacklist or DNSBL) is a database maintained by various organizations that tracks IP addresses and domains known to send spam, host malware, or engage in abusive behavior. Email servers and firewalls use these lists to filter unwanted traffic.
How do I check if my IP is blacklisted?
Enter your IP address into the blocklist check tool above and run a search. The tool will query multiple blocklist databases simultaneously and show you which ones, if any, currently list your IP as a threat or spam source.
Why would my IP or domain end up on a blacklist?
Common reasons include sending bulk or unsolicited email, a compromised server being used to send spam without your knowledge, hosting malware or phishing pages, or simply sharing a server with another user who engaged in abusive behavior.
How do I get removed from a blacklist?
Each blocklist has its own delisting process. After resolving the underlying issue — such as cleaning a compromised account or stopping spam activity — you'll need to submit a delisting request directly to the organizations that have flagged your IP or domain.
Can a domain be blacklisted even without sending spam?
Yes. Domains can get flagged for hosting phishing pages, distributing malware, or being associated with suspicious redirect chains — even if no email was ever sent. It's worth running a check if you notice unusual drops in traffic or email open rates.
How often should I check my domain for blacklisting?
For businesses that rely on email marketing or transactional email, a weekly check is a sensible routine. If you've recently migrated servers, changed hosting providers, or noticed deliverability issues, running an immediate check is a smart first step.