How to find dominant country of .com website visitor/users?

There are tons of .com websites which are designed for users of certain countries. For instance, www.qq.com and www.168.com are two Chinese websites registered under .com - even these are in Chinese language.

For lots of analytic solutions, it is beneficial to know which country does a certain website serve. But, I am not yet able to find such information. I am wondering if you have come across any website, service, trick or dataset that provides such an information.

Please not that my question is not about domestic domains like .ca,.jp,.de but I am only asking about .com

Thanks in advance