Deleting a network interface releases all attributes associated with the interface and releases any private IP addresses or Elastic IP addresses to be used by another instance.
You can't delete a network interface that is in use. First, you must detach the network interface.
To delete a network interface
Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/
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In the navigation pane, choose Network Interfaces.
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Select the checkbox for the network interface, and then choose Actions, Delete.
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When prompted for confirmation, choose Delete.