What is an Availability Zone in AWS?

An Availability Zone (AZ) is a datacenter owned and operated by AWS in which the AWS services run, within an AWS Region.
  • An Availability Zone (AZ) is a datacenter owned and operated by AWS in which the AWS services run
  • Each AWS Region has atleast two Availability Zones, with a maximum of 6 Zones.
  • Availability Zones are represented by a Region Code, followed by a letter identifier
  • For example, US-East-1 has 6 Availability Zones:
    • US-East-1a
    • US-East-1b
    • US-East-1c
    • US-East-1d
    • US-East-1e
    • US-East-1f
  • One cannot choose an Availability Zone directly, one can choose a subnet which correlates to an Availability Zone
  • choosing a Multi-AZ infrastructure distributes instances across multiple Availability Zones, which allows fail over for handling requests when one AZ goes down.
  • This results in high-availability
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Sriram Mannava

I'm a full-stack developer and a software enthusiast who likes to play around with cloud and tech stack out of curiosity.

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