Windows Server 2025 Domain and Functional Levels domainFunctionality and forestFunctionality attributes

The Active Directory domain and functional levels have changed for Windows Server 2025 with a new functional level being added.

However the documetnation for the 3.1.1.3.2.26 domainFunctionality and 3.1.1.3.2.27 forestFunctionality attributes have not been updated.

https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-adts/6dd88965-8feb-4369-ae7e-075985da8071


0 DS_BEHAVIOR_WIN2000

1 DS_BEHAVIOR_WIN2003_WITH_MIXED_DOMAINS

2 DS_BEHAVIOR_WIN2003

3 DS_BEHAVIOR_WIN2008

4 DS_BEHAVIOR_WIN2008R2

5 DS_BEHAVIOR_WIN2012

6 DS_BEHAVIOR_WIN2012R2

7 DS_BEHAVIOR_WIN2016


The new value 

10 DS_BEHAVIOR_WIN2025


Notice there is a gap of two numbers for Server 2016 and Server 2019 that didn't have an update to the domain and forest functional levels.


 While you're here -
Why not check out our Active Directory Documentation Tool?




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