geoipgen is an IP network tool written in Ruby for generating geotargeted lists of IP Addresses using MaxMind’s Free Open Source GeoLite Country database (www.maxmind.com). Examples: Generate all IPs for New Zealand (./geoipgen -s nz), generate 10,000 random ips for far east asia (geoipgen -n 10000 cn hk mn tw mo jp kr kp), indefinitely generate random ips for japan (geoipgen jp).
You can download it from the following link: https://packetstormsecurity.com/files/download/70504/geoipgen0.2b.tgz
Source: https://packetstormsecurity.com/files/70504/geoipgen0.2b.tgz.html