I am sure most of the pen-testers here has used this tool

"reverse ip domain check-up"

(i.e when we enter the ip address or one of the web-sites name,it displays the name of all the web-sites hosted in it the ip address)

I have been trying to understand the working logic behind this,
but unfortunately i couldn't find it.


i just want to know the working logic of this tool..

As usual i have got some questions regarding this:

1)Is it possible for us to determine the number of web-sites running on a web-server manually?if yes how ?

2) To which level we can trust these information?

3)how does this thing work?

hope i will know the working logic soon :)