A supported extension is a mechanism for identifying the [Extended Request] supported by the Directory Server.  The [OIDs|Definition -- Object Identifier] of these extended operations are listed in the {{supportedExtension}} attribute of the server's [root DSE].

We also have an extensive [LDAP Extensions and Controls Listing].

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]