diff --git a/README.md b/README.md
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+++ b/README.md
@@ -663,6 +663,7 @@ algorithms, knowledgebase and AI technology.
 * [Kloth](http://www.kloth.net/services)
 * [Majestic](https://majestic.com) - Find out who links to your website.
 * [MaxMind](https://www.maxmind.com)
+* [MetaDefender](https://metadefender.com) - Threat analysis service for URLs, files, certificates, domains, and suspicious hashes.
 * [Netcraft Site Report](http://toolbar.netcraft.com/site_report?url=undefined#last_reboot) - is an online database that will provide you a report with detail information about a particular website and the history associated with it.
 * [NetworkTools](http://network-tools.com)
 * [Open Site Explorer](https://moz.com/researchtools/ose)