You might notice - already busted. Half of China got bummed at the same time.

I don't bother blocking single IP addresses - I go for the jugular - the ISP's entire subnet range.
inetnum: 60.208.0.0 - 60.217.255.255
netname: UNICOM-SD
descr: China Unicom Shandong province network
descr: China Unicom