Mass block subnets

[oyo]

Hi,
I'm running ISPC3 on Ubuntu 11.04, and is looking for a good way to mass block subnets (basically countries), and not f**k things up with ISPC.
I'm thinking of using this page as a source for IPs.

I've been searching, and found this that looks almost perfect but, the only thing is that I want to block with the format ip 1.2.3.4/24,
and also I'm not sure if this script is compatible with ISCP3? Anyone have some input on that?

I also found this link, but I don't want to do it all manually, when its tens of thousand of subnets! Anyone have a script that can do the same thing, but read the subnets from a file?

Or does anyone have some other good advice for me?