Blocking Sites

I was wondering if there is anyway of blocking sites through a router only to certain ips. Any help?

 

Go to your router configuration page by typing your router's IP in web browser (URL bar) which should be like 69.137.X.X.

Once you type your full IP in the URL hit enter and the configuration page will pop up, there it will give you a option to block sites.

 

I know that. I mean i only want it blocked for certain computers. and others i want it unblocked.

 

You have to do it directly from the browser, such as Firefox, IE, Opera, Chrome.