AWS Availability Zone Lookup
Look up how many Availability Zones a given AWS region has, and understand the difference between regions and AZs.
Select a region to see its typical Availability Zone count - and the explanation below clarifies exactly how AZs relate to regions.
Use the AWS Region Lookup tool alongside this one if you need the exact region code for a location.
Regions vs. Availability Zones
A Region is a geographic area; an Availability Zone (AZ) is one or more physically separate data centers within that region, each with independent power and networking. Spreading resources across multiple AZs in the same region protects against a single data center failure.
Why Use This Tool?
Confusing a region with an AZ is a common early mistake - this tool makes the distinction concrete by showing how many AZs a given region actually has, which matters when designing for high availability.
How to Use It
- Select an AWS region.
- See its typical Availability Zone count and AZ naming pattern (e.g.
us-east-1a,us-east-1b).
Limitations
AZ counts can change as AWS expands a region's infrastructure - treat these as a reference, and confirm against the AWS console or CLI (describe-availability-zones) for your account's exact current access.