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# Create a custom ID range for virtual MAC addresses, virtual WWNs, or virtual 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/ranges`.

When you create a custom range, you must provide the attributes using one of the following combinations:

- The start address and end address. The total count is calculated automatically based on the start address and end address.

- The start count and total count. The end address is calculated automatically based on the total count.

The range category is custom.

### Prerequisites

- Minimum required session ID privileges:

  - Network administrator (virtual MAC addresses, virtual WWNs)

  - Server administrator (virtual serial numbers)

  - Infrastructure administrator (all ID types)

Creating a custom ID range for virtual MAC addresses using REST APIs
`POST /rest/id-pools/vmac/ranges`

Creating a custom ID range for virtual WWNs using REST APIs
`POST /rest/id-pools/vwwn/ranges`

Creating a custom ID range for virtual serial numbers using REST APIs
`POST /rest/id-pools/vsn/ranges`

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