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There are no performance differences between the AZs. Also note that AWS maps the physical Availability Zones randomly to the Availability Zone names for each AWS account. This approach helps to distribute resources across the Availability Zones in an AWS Region, instead of resources likely being concentrated in Availability Zone "a" for each Region. As a result, the Availability Zone us-east-1a for your AWS account might not represent the same physical location as us-east-1a for a different AWS account.
Reference: https://docs.aws.amazon.com/ram/latest/userguide/working-with-az-ids.html
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Thank you Tushar, I have another doubt same topic of Availability zone for ip rang is less on 1a compare to 1b and 1c . Why we get less ip range for 1a? Is there anything specific reason?