Where can I find a list of IPs and their regions.

I've look at IANA but it doesn't give enough detailed information. I would like to find a list of /8 or /16s and what geographic region the exist in. I know it isn't an exact science but something close would be nice. I know 210/8 & 211/8 are APNIC, I likes to know stuff like 210.100/16 is Korea and 210.120/16 is China, etc. Does anyone have a list I can pull from? -Matt