Guides
Instance Location
For best performance, make sure that the EC2 instance is in the same availability zone as the S3 Express One bucket you are querying. To determine the mapping between zone names and zone IDs, use the `aws ec2 describe-availability-zones` command.  
* Zone name to zone ID mapping:  
```batch
aws ec2 describe-availability-zones --output json \
| jq -r '.AvailabilityZones[] | select(.ZoneName == "us-east-1f") | .ZoneId'
```  
```text
use1-az5
```  
* Zone ID to zone name mapping:  
```batch
aws ec2 describe-availability-zones --output json \
| jq -r '.AvailabilityZones[] | select(.ZoneId == "use1-az5") | .ZoneName'
```  
```text
us-east-1f
```