require 'json'
require 'open-uri'
require 'pry'

url = "https://api.config.zscaler.com/zscaler.net/cenr/jsonip"

uri = URI.parse(url)
data = uri.read
json = JSON.parse data
americas = json['Geo_regions']['Americas'].values.flatten
active = americas
  .select{|h| h['notes'].size == 0 || h['notes'][0] != 'Not Ready for Use'}
  .each{|h| h.delete('vpn_hostname')}
  .each{|h| h.delete('proxy_hostname')}
  .each{|h| h.delete('gre_vip')}
active.map{|h| h['cidr']}.each{|s| puts s}