Extensive Discoveries found from footprinting

The major reason of footprinting is  to gather information about our target  

like organization information such as there employee details there telephone numbers there office details  background of the organization the type of technology and services the use  there news articles 

we can also get there domain and sub domain network blocks,IP address the types of IDS and IPS the use  there Dns record and there whois record and also we can get there syetm information like web server location of web sever public available or uncongisugrued usrname and password text file