AD domain controller upgrade requirements
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Microsoft's commit message in MicrosoftDocs/windowsserverdocs · commit cfe4b72 · +3 −3 lines · also on GitHub
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ms.author: roharwoo
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author: robinharwood
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manager: daveba
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−ms.date: 05/12/2025
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+ms.date: 05/28/2025
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ms.topic: upgrade-and-migration-article
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---
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# Upgrade domain controllers to a newer version of Windows Server
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- To install or remove a domain in an existing forest, you need connectivity to the **domain naming master**.
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- Any DC installation also requires connectivity to the **RID master.**
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- If you're installing the first read-only DC in an existing forest, you need connectivity to the **infrastructure master** for each application directory partition, which is also known as a non-domain naming context.
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To find out which server or servers hold which FSMO role, run the following commands in an elevated PowerShell session by using an account that's a member of the Domain Admins group:
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```PowerShell
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Get-ADDomain | FL InfrastructureMaster, RIDMaster, PDCEmulator
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Get-ADForest | FL DomainNamingMaster, SchemaMaster
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