ruby.rb

#!/usr/bin/ruby

require 'ipaddr'

network1 = IPAddr.new("10.0.0.0/8")
network2 = IPAddr.new("172.16.0.0/16")

addresses = ['10.10.10.10', '10.10.10.20', '10.10.10.30']

addresses.each do |address|
    if network1.include?(address)
        puts "In 10.0.0.0/8"
    end
    if network2.include?(address)
        puts "In 10.0.0.0/8"
    end
end