How do i track the visitor's country and redirect them to appropriate sites?

Question

I want to track the country of the visitors and then redirect them to appropriate subdomains of my site like what google does...

And upto what extent i can rely on the d

Answer 1

One version is that you can use your service providers' ip address and hence redirect it with Javascript as follows;

$.get("https://ipinfo.io", function(response) {
   if(response.country=="GB"){
      window.location.replace("http://stackoverflow.com");
   }
}, "jsonp");