incrediBILL - 3:45 am on Aug 31, 2013 (gmt 0)
collateral damage of people using data centre IPs for web proxies
That's not collateral damage, that's a bonus.
Never had anything but trouble out of web proxies including 302 hijacking back in the day.
IP ranges are like a firewall and you can still punch holes through it for various services by whitelisting them ahead of the IP range firewalls.
The country IP range database can be downloaded for free from Maxmind which easily allows countries to be blocked by country code with just a couple of lines of code, it's very fast, and avoids the bazillion lines of DENY statements.