Shodan has servers located around the world that crawl the Internet. The Shodan plugin automatically checks whether Shodan has any information for the current website.
/ Where is the website hosted, who owns the IP and what other services/ ports are open.
/ Is the website also running FTP, DNS, SSH, or some unusual service? With this plugin you can see all the info that Shodan has collected on a given website/ domain.
/ What companies are affected by Heartbleed?