title: How do I lock down outbound firewall access to AWS S3
body: <p>I'm running a node app which is using the <a href="https://www.npmjs.com/package/aws-sdk" rel="nofollow">AWS-SDK module</a> to talk to AWS S3.</p>
  
  <p>The infrastructure team want to lock down the firewall but it's not clear what IPs we'll need to lock it down to. </p>
  
  <p>Is there a guide anywhere to how to do this or does anyone have experience of locking this down?</p>
  
  <p>Thanks</p>