diff --git a/README.md b/README.md
index fb8950c..e9c9813 100644
--- a/README.md
+++ b/README.md
@@ -300,6 +300,8 @@ A curated list of awesome malware analysis tools and resources. Inspired by
 * [MaltegoVT](https://github.com/michael-yip/MaltegoVT) - Maltego transform
   for the VirusTotal API. Allows domain/IP research, and searching for file
   hashes and scan reports.
+* [Multi rbl](http://multirbl.valli.org/) - Multiple DNS blacklist and forward 
+  confirmed reverse DNS lookup over more than 300 RBLs.
 * [SenderBase](http://www.senderbase.org/) - Search for IP, domain or network
   owner.
 * [SpamCop](https://www.spamcop.net/bl.shtml) - IP based spam block list.