Shortest Guide To Shodan

 Shodan In a Nutshell :

Shodan Is Basically  a search engine that uses the Internet to search for public computers. 

Shodan is a web-based service which  is primarily used in cyber security by professionals, scientists and law enforcement officers.

Without an Shodan account, 10 results are returned and 50 results returned to the user without an account. Users pay a fee if they wish to lift the minimum result limit. 

Shodan uses mainly web-based data for HTTP, 80, 8080, 443 and FTP and SSH, 22 and Telnet, 161 and SNMP, 993 and 143 servers and in-time streaming protocols to generate information, especially on web servers.

Form Places, road signals, video projectors, service metadata, routers, subnet or domain home heating systems for wired devices, open ports, default passwords, To  documented vulnerabilities You will find them in Shodan.