Note:
- The Elastic Network Interface (ENI) only supports the release of secondary IP addresses, but not primary IP addresses.
- After a private IP is unbound, its associated Elastic IP (EIP) will be automatically unbound.
You can log in to the VPC console and click IP And Network Card > ENI in the left-side directory to open the Elastic Network Interface list page.
Click the instance ID you want to view to open the details page. Click IPv4 Address Management in the tab, find the row where the private IP to be released is located, and click Release in the Action column.

3. Click OK in the pop-up window to complete the operation.