Purpose of the Real Time Blacklist Check Tool

The Real Time Blacklist Check Tool queries a number of blacklist repository servers and reports the results of the check.

About the Real Time Blacklist Check Tool

Realtime Black List servers are used by internet service providers to reduce the quantity of spam and malware received by their SMTP email servers. The Realtime Black List (sometimes called RBL) Check tool accepts an IPv4 address or hostname and checks many Realtime Black List servers for the presence of the IPv4 address in their databases. If the IP address is found, we retrieve additional information about the IP address from the Realtime Black List server and show it. The comments sent by the blacklist server often contain links so you can go to see even more details. Realtime Black Lists are one method used by ISPs to validate the source of an email message.


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RBL Check Screenshot

RBL Check Screenshot

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How the Real Time Blacklist Tool works

The RBL Check Process
  • Start by verifying you have the IP address of a publically accessible DNS entered in the Current DNS Server field. Publically accessible means that it has full access to the global DNS system.
  • Enter an IPv4 address you found in the headers of an email. Then press Check Blacklists.
  • The tool queries a number of servers in parallel, puts their results in the grid, then sorts it by the comments column when complete. The comments often contain links to more detailed information.

A video of the Real Time Blacklist Tool in action!

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Blacklist servers are specialized DNS servers that contain IP addresses of mail servers known to originate SPAM or found to be open relays. They are usually actively maintained and all have different methods and criteria for adding and removing IP addresses from their lists.