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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