About Shodanhq

Shodan is a search engine that lets you find specific computers (routers, servers, etc.) using a variety of filters. Some have also described it as a public port scan directory or a search engine of banners.
Shodan also lets you use boolean operators (‘+’, ‘-’ and ‘|’) to include/ exclude certain terms. By default, every search term has a ‘+’ operator assigned to it.
In addition to boolean operators, there are special filters to narrow down the search results.