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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?

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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.

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