title: RDS endpoint name format
body: <p>In AWS, RDS Endpoint names have the following format</p>
  
  <pre><code>my-db-name.aaaaaaaaaaaa.eu-west-1.rds.amazonaws.com
  </code></pre>
  
  <p>the second part of the identifier is a series of seemingly random characters. How is this generated? It seems to be consistent across all rds instances in the same account and region. Are there any other factors that would cause it to change. </p>
  
  <p>I had a look thorugh the AWS docs but couldn't find any relevant information.</p>