You can delete a subnet to release network resources if the subnet is no longer required.
You can delete a subnet only if there are no resources in the subnet. If there are resources in the subnet, you must delete those resources before you can delete the subnet.
You can view all resources of your account on the console homepage and check the resources that are in the subnet you want to delete.
The resources may include:
in the upper left corner and select the desired region and project.A confirmation dialog box is displayed.