# InstanceUsage
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Information about the Capacity Reservation usage.

## Contents
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 ** accountId **   
The ID of the Amazon Web Services account that is making use of the Capacity Reservation.  
Type: String  
Required: No

 ** usedInstanceCount **   
The number of instances the Amazon Web Services account currently has in the Capacity Reservation.  
Type: Integer  
Required: No

## See Also
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For more information about using this API in one of the language-specific Amazon SDKs, see the following:
+  [Amazon SDK for C\+\+](https://docs.amazonaws.cn/goto/SdkForCpp/ec2-2016-11-15/InstanceUsage) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/ec2-2016-11-15/InstanceUsage) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/ec2-2016-11-15/InstanceUsage)