title: IP Whitelisting all Amazon EC2 servers in Region Ireland
body: <p>I have a web service which runs on Elastic Beanstalk, with a dynamic amount of instances, I have an external service that needs to whitelist my IP's, they can whitelist an entire region, where can I find all possible IP's used by amazon in Ireland?</p>
  
  <p>I have tried setting up a NAT gateway, but it seems overly complicated.</p>