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title description services ms.date ms.author author ms.service ms.subservice ms.topic
Assign private IP address prefixes to VMs - Azure portal
Learn how to assign private IP address prefixes to a virtual machine using the Azure portal.
virtual-network
11/07/2024
mbender
ramandhillon84
azure-virtual-network
ip-services
how-to

Assign private IP address prefixes to virtual machines using the Azure portal - Preview

This article helps you add secondary IP configurations on a virtual machine NIC with a CIDR block of private IP addresses using the Azure portal. An Azure Virtual Machine (VM) has one or more network interfaces (NIC) attached to it. All the NICs have one primary IP configuration and zero or more secondary IP configurations assigned to them. The primary IP configuration has a single private IP Address assigned to it and can optionally have a public IP address assignment as well. Each secondary IP configuration can have the following items:

  • A private IP address assignment and (optionally) a public IP address assignment, OR
  • A CIDR block of private IP addresses (IP address prefix).

All the IP addresses can be statically or dynamically assigned from the available IP address ranges. For more information, see IP addresses in Azure. All IP configurations on a single NIC must be associated to the same subnet. If multiple IPs on different subnets are desired, multiple NICs on a VM can be used. For more information, see Create VM with Multiple NICs.

There's a limit to how many IP configurations can be assigned to a NIC. For more information, see the Azure limits article.

Important

The capability to add private IP address prefixes to NIC is currently in PREVIEW. See the Supplemental Terms of Use for Microsoft Azure Previews for legal terms that apply to Azure features that are in beta, preview, or otherwise not yet released into general availability.

:::image type="content" source="./media/virtual-network-private-ip-addresses-blocks-portal/block-ipconfigs.png" alt-text="Diagram of network configuration resources created in article." lightbox="./media/virtual-network-private-ip-addresses-blocks-portal/block-ipconfigs-expand.png":::

Prerequisites

  • An Azure account with an active subscription. Create an account for free.

  • An existing Azure virtual machine. For more information about creating a virtual machine, see Create a Windows VM or Create a Linux VM.

    • The example used in this article is named myVM. Replace this value with your virtual machine name.

  • To use this feature during Preview, you must first register. To register, complete the Onboarding Form.

Important

Before proceeding, register for this Preview by completing the Onboarding Form.

Add a dynamic private IP address prefix to a VM

You can add a dynamic private IP address prefix to an Azure network interface by completing the following steps.

  1. Sign in to the Azure portal.

  2. In the search box at the top of the portal, enter Virtual machine. Select Virtual machines in the search results.

  3. In Virtual machines, select myVM or the name of your virtual machine.

  4. Select Networking in Settings.

  5. Select the name of the network interface of the virtual machine.

  6. In the network interface, select IP configurations in Settings.

  7. The existing IP configuration is displayed. This configuration is created when the virtual machine is created. To add a private and public IP address to the virtual machine, select + Add.

  8. In Add IP configuration, enter or select the following information.

    Setting Value
    Name Enter ipconfig2.
    Private IP address settings
    Private IP Address Type IP address prefix
    Allocation Select Dynamic

  9. Select OK.

    [!NOTE] Public IP address association is not available for configuration when IP address prefix option is selected.

  10. After you change the IP address configuration, you must restart the VM for the changes to take effect in the VM.

Add a static private IP address prefix to a VM

You can add a static private IP address prefix to a virtual machine by completing the following steps.

  1. Sign in to the Azure portal.

  2. In the search box at the top of the portal, enter Virtual machine. Select Virtual machines in the search results.

  3. In Virtual machines, select myVM or the name of your virtual machine.

  4. Select Networking in Settings.

  5. Select the name of the network interface of the virtual machine.

  6. In the network interface, select IP configurations in Settings.

  7. The existing IP configuration is displayed. This configuration is created when the virtual machine is created. To add a private and public IP address to the virtual machine, select + Add.

  8. In Add IP configuration, enter or select the following information.

    Setting Value
    Name Enter ipconfig2.
    Private IP address settings
    Private IP Address Type IP address prefix
    Allocation Select Static.
    IP address Enter an unused CIDR of size /28 from the subnet for your virtual machine.
    For the 10.0.0.0/14 subnet in the example, an IP would be 10.0.0.0/80.

  9. Select OK.

    [!NOTE] When adding a static IP address, you must specify an unused, valid private IP address CIDR from the subnet the NIC is connected to.

  10. After you change the IP address configuration, you must restart the VM for the changes to take effect in the VM.

[!INCLUDE virtual-network-multiple-ip-addresses-os-config.md]

Next steps