# Public IP Address Prefix
A [Public IP Address Prefix](https://learn.microsoft.com/en-us/azure/virtual-network/ip-services/public-ip-address-prefix) reserves a range of consecutive public IP addresses that you can individually assign to public resources. This is useful for scaling because it provides a globally unique address space, supports expansion across locations, facilitates load balancing, enables secure access control, and is fundamental for connecting to multiple ISPs and participating in internet routing protocols.
## Adding a Public IP Address Prefix
1. Select the correct **Tenant** from the Tenant list in the upper left.
2. In the DuploCloud Portal, navigate to **Cloud Services** -> **App Integration**.
3. Click on the **Public IP Prefix** tab.
The Public IP Prefix tab.
4. Click **Add**. The **Add Public IP Prefix** pane displays.
5. In the **Name** field, enter a name. Select your desired length (number of addresses) from the **Prefix Length** item list. Select the resource type from the **Resource Type** item list.
The Add Public IP Prefix pane.
6. Click **Add**. Your **Public IP Prefix** is created.
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