Shodan is an acronym for Sentient Hyper Optimized Data Access Network. Unlike traditional search engines that crawl the website to display results, Shodan attempts to grab data from the ports. Developed by John Matherly, Shodan is available as a free version as well as a professional, paid version. The free version provides up to 50 results, beyond which one needs to procure the paid version. Creative usage of the Shodan OSINT tool helps find the vulnerable services in a Web server, which is a very important aspect of the vulnerability assessment phase. Various filters such as country, port, operating system and host names are available with this tool.