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.