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# Create an automatically generated ID range for virtual MAC addresses, WWNs, or serial numbers

When the appliance starts for the first time, a random range, called the default range, is created for each pool. In addition to this range, you can add an automatically generated range. Before you create an automatically generated range, you must select an available generated range.

Each type of range uses a different REST API. For example, to create a virtual MAC address range, you use `/rest/id-pools/vmac`.

When you create an automatically generated range, the following attributes are required:

- The start address and end address of the available range obtained through the `GET` operation.

- The total count.

| NOTE: The range category is generated.

### Prerequisites

- Minimum required session ID privileges:

  - Network administrator (virtual MAC addresses, virtual WWNs)

  - Server administrator (virtual serial numbers)

  - Infrastructure administrator (all ID types)

Creating an automatically generated ID range for virtual MAC addresses using REST APIs
Select a generated range that is not in use. `GET /rest/id-pools/vmac/generate` Create the ID range. `POST /rest/id-pools/vmac/ranges`

Creating an automatically generated ID range for virtual WWNs using REST APIs
Select a generated range that is not in use. `GET /rest/id-pools/vwwn/generate` Create the ID range. `POST /rest/id-pools/vwwn/ranges`

Creating an automatically generated ID range for virtual serial numbers using REST APIs
Select a generated range that is not in use. `GET /rest/id-pools/vsn/generate` Create the ID range. `POST /rest/id-pools/vsn/ranges`

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