blocking tcp/udp

Is there a method to block all traffic from specific countries? A complete listing of all tcp/ip addresses assigned to China, for instance, is quite long. Entering them one by one into the Network Monitor is most time consuming.

I am wondering if they can find a way to block all pedophiles and sex predators banned from the internet, collect their IPS and block them out entirely to free bandwidth since nobody likes them anyways and they are waste of oxygen

Not in v2. v3 should have an IP blocker soon, so we can handle big lists.

If you use v2, i suggest PeerGuardian2 or Protowall.