We are getting many fake account and spam attempts from IP addresses originating from ChinaNet.com. How can I discover all of their IP blocks? I viewed a report from 2001 that mentioned they did not protect against abuse.
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First, any report from 2001 is worth slightly less than the paper on which it is printed. It's 10 year old data.
Second, You are reaching for the wrong solution: You should implement real heuristic-based spam filtering, not just block IP ranges because you feel like it.
Third, If you really want to do do this then AS numbers are your fiends.
There are many services out there than can provide this information. The one I would recommend is from MaxMind.