How do I find out reginal/country IP blocks?

I have say this thread is not exactly a technical issue but it does relate to firewall setup so it's about security.

I am trying to find all blocks of IP assigned to whole China, and I will put these Ip blocks to my firewall deny hosts. However, in doing this, I need to make sure all the IP blocks are none of the richest countries such as Japan, Taiwan, HK, Singapore. Any idea or url?

 

 

 

 

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