Define host name-to-Kerberos realm mappings: registry value HostToRealm (domain_realm)ComputerHKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos\domain_realm

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

Registry

domain_realm_Enabled

-Computer

HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos

(list values)

REG_SZComputer

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

Enabled value: Depends on the option value
Element: Define host name-to-realm mappings:
Value type: REG_SZ
Add to existing value: true
Explicit value name: true

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos\domain_realm]
"<enter name>"="<enter value>"

CMD

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

PowerShell

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