To find a list of OUs in the domain run this command:
netdom query OU
To find out which servers hold which FSMO roles run this command:
netdom query fsmo
To find out which server is the PDC Emulator run this command:
netdom query PDC
To find out a list of your domains trusts run this command:
netdom query trusts
To find a list of all workstations on the domain run this command:
netdom query workstation
To find a list of all workstations on the domain run this command:
netdom query server
To find a list of all domain controllers on the domain run this command:
netdom query DC