title: What's the source IPs of AWS SNS HTTP/HTTPS notification?
body: <p>I have configured AWS SNS notification to call my HTTP endpoint. I need to open my firewall to allow AWS SNS to call it.  </p>
  
  <p>However, I cannot find any information about SNS HTTP(s) notification call IPs. I have caught a few IPs <strong>(54.240.194.1,54.240.194.65,54.240.194.129 )</strong> by it's calls. But I'm not sure <strong>what's the full list of SNS HTTP notification source IPs.</strong></p>
  
  <p>I can open my firewall as 54.240.194.0/24. But no official information this is correct.</p>
  
  <p>Thanks.</p>