I'm trying to block all the PC, laptops and send them to a blank page or any page that I set it up for a PCs site.
I just have a mobile version website and I only want to allow iOS such as iPad, iPod and iPhone to visit my website and block the rest for my security purpose
I'm trying to search in here and Google; I think I'm using some kind of wrong term or maybe something like that. I don't know exactly but I see many web sites do that.
I would just scan the user-agent. Find the ones that you will accept and then redirect the rest to a non-blank sorry page. A blank page would not be very nice, so a simple sorry would do. I say this because maybe the user has a mobile device to use, but happens to be on a pc. A blank page would make them think that the site is junk or doesn't work and you might lose their mobile traffic also.