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Add-DhcpServerv6Reservation

Adds an IPv6 Reservation to an IPv6 prefix or scope.

Networking / Security · Risk: High · Documentation Verified

Last verified: 2026-10-26

Microsoft DhcpServer reference: Adds an IPv6 Reservation to an IPv6 prefix or scope. The syntax and selected example below are adapted from the pinned Windows Server 2025 reference. Module availability, target configuration and delegated permissions determine whether it can run in your environment. Documentation and parameter text: Microsoft, CC BY 4.0; formatting adapted by Cmdlet World. No execution testing is claimed.

Add-DhcpServerv6Reservation [-ComputerName <String>] [-IPAddress] <IPAddress> [-ClientDuid] <String>
 [-Iaid] <UInt32> [[-Name] <String>] [-Description <String>] [-Prefix] <IPAddress> [-PassThru]
 [-CimSession <CimSession[]>] [-ThrottleLimit <Int32>] [-AsJob] [-WhatIf] [-Confirm] [<CommonParameters>]

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Required permissions

Use an account with the target resource permissions documented for Add-DhcpServerv6Reservation. Modifying administrative cmdlets may require elevation or delegated administration. This catalog does not assert that ordinary users can execute the command.

Supported environments

Windows / DhcpServer · Windows Server 2025 documentation; feature/module prerequisites apply

Parameters

-AsJob: Runs the cmdlet as a background job. Use this parameter to run commands that take a long time to complete. The cmdlet immediately returns an object that represents the job and then displays the command prompt. You can continue to work in the session while the job completes. To manage the job, use the *-Job cmdlets. To get the job results, use the Receive-Job cmdlet. For more information about Windows PowerShell® background jobs, see about_Jobs.
-CimSession: Runs the cmdlet in a remote session or on a remote computer. Enter a computer name or a session object, such as the output of a New-CimSession or Get-CimSession cmdlet. The default is the current session on the local computer.
-ClientDuid (required): Specifies the DUID of the client.
-ComputerName: Specifies the DNS name, or IPv4 or IPv6 address, of the target computer that runs the DHCP server service.
-Confirm: Prompts you for confirmation before running the cmdlet.
-Description: Specifies the description string for the IPv6 reservation that is created.
-IPAddress (required): Specifies the IPv6 address to reserve for the client.
-Iaid (required): Specifies the DHCPv6 IAID of a specific network interface of the client.
-Name: Specifies the name of the client. This parameter value can be the actual host name of the client or a name assigned to identify the reserved client on the DHCP server service.
-PassThru: Returns an object representing the item with which you are working. By default, this cmdlet does not generate any output.
-Prefix (required): Specifies the IPv6 prefix which identifies the scope in which the reservation is created.
-ThrottleLimit: Specifies the maximum number of concurrent operations that can be established to run the cmdlet. If this parameter is omitted or a value of 0 is entered, then Windows PowerShell® calculates an optimum throttle limit for the cmdlet based on the number of CIM cmdlets that are running on the computer. The throttle limit applies only to the current cmdlet, not to the session or to the computer.
-WhatIf: Shows what would happen if the cmdlet runs. The cmdlet is not run.

Prerequisites

Windows with the DhcpServer module and the Windows feature or management tools that provide it. Confirm target connectivity and version compatibility using the linked Microsoft reference.

Security considerations

This cmdlet changes system state. Review every target and parameter in the official reference, test outside production, and prepare an appropriate backup or rollback. Do not execute the example automatically.

Examples

Example 1: Reserve an IP address

Add-DhcpServerv6Reservation -Prefix 2001:4898:7020:1020:: -IPAddress 2001:4898:7020:1020::1 -ClientDuid "00-01-00-01-15-F9-7F-AB-F0-DE-F1-7A-00-5E" -Iaid 234890455

This example reserves the specified IPv6 address for the specified *ClientDuid* and *Iaid* parameter values. After the reservation is added, the DHCP server service assigns only the specified IP address to the client request which contains the specified *ClientDuid* and *Iaid* parameter values. Source: Microsoft, CC BY 4.0; transcript prompt/output removed. This example was not executed.

Sources

https://github.com/MicrosoftDocs/windows-powershell-docs/blob/b7645dd8c687139b28e845119da30ec670526507/docset/winserver2025-ps/DhcpServer/Add-DhcpServerv6Reservation.md

https://learn.microsoft.com/powershell/module/dhcpserver/add-dhcpserverv6reservation?view=windowsserver2025-ps

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