Assign a default domain for logon: registry value DefaultLogonDomainComputerHKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System

Policy ID: DefaultLogonDomain
Scope: Computer Configuration
Supported on: At least Windows Vista
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: System › Logon

Registry

DefaultLogonDomain

REG_SZComputer

HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System Current key

Enabled value: Depends on the option value
Element: Default Logon domain:
Value type: REG_SZ
Maximum length: 4096

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System]

; Value names and types follow the ADMX. Replace <enter value> below with your own data
"DefaultLogonDomain"="<enter value>"

CMD

:: Value names and types follow the ADMX. Replace <enter value> below with your own data

reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v "DefaultLogonDomain" /t REG_SZ /d "<enter value>" /f

PowerShell

# Value names and types follow the ADMX. Replace <enter value> below with your own data

New-Item -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System' -Force | Out-Null
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System' -Name 'DefaultLogonDomain' -PropertyType String -Value '<enter value>' -Force | Out-Null