Zulu - a free service from Zscalar that scans websites for potential threats. This service uses mix of proprietary-based and open-source tools to scan sites and provide security ratings. Threat rating is done through the use of heuristics, reputation and host domain analysis for a particular URL. It supports direct URLs as well as addresses masked with URL shortening services. These days web-based threats are so dynamic and this service ensures that continually updated content, fed from proprietary Zscaler and public sources, is combined to identify even newly deployed web-based threats.