Use netdom to find where the current FSMO roles are assigned in Active Directory:
netdom query fsmo
This will return something like:
Schema master DC01.local Domain naming master DC02.local PDC DC01.local RID pool manager DC02.local Infrastructure master DC01.local The command completed successfully.
The 'netdom query' command can also return other useful information. Valid types include:
Server, Workstation, DC, OU and Trust