aws-ip-ranges

#!/usr/bin/env ruby

require 'net/http'
require 'json'

addresses = Array.new(33) { |i| 2**(32 - i) }

uri = URI('https://ip-ranges.amazonaws.com/ip-ranges.json')
req = Net::HTTP::Get.new(uri)
response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(req)
end

total = JSON.parse(response.body)['prefixes'].reduce(0) do |count, prefix|
  range = prefix['ip_prefix'].split('/')
  range_count = addresses[range.last.to_i]
  puts "Range #{prefix['ip_prefix']}, #{range_count}"
  count + range_count
end

puts "Total #{total}"