What is the maximum number of domains a forest can contain?

The answer to this question depends on the operating system of your forest.

- Windows 2000: 800 domains

- Windows 2003/2008: 1200 domains

These are Microsoft’s recommendations.

Another interesting note is that your domain controllers can only create 2,147,483,393 before they can no longer create any more new objects. I think it is safe to say that most organizations will not hit this limit in a domain controllers lifetime.

http://support.microsoft.com/kb/909264

http://technet.microsoft.com/en-us/library/active-directory-maximum-limits-scalability(WS.10).aspx#BKMK_Forest

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How to list all the AD LDS instances on a server

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Jason Yoder, MCT

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