You are in Resources
Real-Time Blocklist Check
Real-time blocklists are used by email server administrators to reject email in an attempt to reduce the amount of spam or unsolicted email received by their users. You can use the tool on this page to check if an IP address or domain has been blacklisted.
If you would like to check your IP address but are not sure what it is, check out What Is My IP Address?
Check IP Address
To test an IP address, please enter it below.
Check Domain (Still under development)
If you are having trouble sending email from a particular domain but are not sure which IP addresses to check, please enter the domain below. We will try to establish which IP addresses send email for that domain first via it's SPF record (Sender Policy Framework) or secondly via DNS records. The tool will then check the RBLs for any black-listed IP addresses.
Please Note: The domain test is still under development. You are welcome to try it, but no warranty is given to it's accuracy.