What is the a,b,c,d,e after the Amazon Availability Zone? (example: us-east-1d)

Question

Amazon uses zones that look like this: us-east-1d. I can find plenty of documentation about us-east-1, etc... but I do not see any reference to the a,b,c,d,e. What does this letter represent?

Answer 1

You can slipt it up like this, for example, consider us-east-1a:

• us-east-1 >> Region’s ID
• d >> Availability Zone’s ID

Consider US West, there are two regions:

1. us-west-1 (North Virginia)

2. us-west-2 (Oregon)

And both the region’s will have their own AZ’s IDs like a,b, or c.

Check out the Regions and Availability Zones documentation for more information.