We can control website or ip to access or accessed by squid proxy server . We can set timely access rule or some ip range to acccess the server or also can block some website or ip for a range of ip or for  some limited time .

If you have completed your installation of squid proxy server then you can see how your proxy server working and how it is handling caching or contents .

Some times we need to control internet users in public hotspot or wifi or also school-college-university network . Anyone can control domains accessed by squid proxy by this tutorial .