title: What does "IPv4 addresses in the same AS" mean?
body: <p>I'm in the process of moving a website from HostGator to Amazon EC2. Front end and back end are both moved. I added a Hosted Zone in Amazon Route 53 and updated my nameservers in HostGator. Unfortunately, the site won't load.</p>
  
  <p>I ran a check with Zonemaster and received the following warnings:</p>
  
  <blockquote>
    <p>All nameservers in the delegation have IPv4 addresses in the same AS
    (16509). All nameservers in the delegation have IPv6 addresses in the
    same AS (16509).   All nameservers in the delegation are in the same AS
    (16509).</p>
  </blockquote>
  
  <p>I've searched but can't figure out what "AS" means in this context. Would love some help to point me in the right direction for troubleshooting.</p>
  
  <p>The domain in question is tektonbody.com.</p>
  
  <p>Thanks!</p>