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Determining FSMO Role Holders

How can I determine who are the current FSMO Roles holders in my domain/forest ?

Windows 2000/2003 Active Directory domains utilize a Single Operation Master method called FSMO (Flexible Single Master Operation), as described in Understanding FSMO Roles in Active Directory.

The five FSMO roles are:

Schema master - Forest-wide and one per forest.
Domain naming master - Forest-wide and one per forest.
RID master - Domain-specific and one for each domain.
PDC - PDC Emulator is domain-specific and one for each domain.
Infrastructure master - Domain-specific and one for each domain.

In most cases an administrator can keep the FSMO role holders (all 5 of them) in the same spot (or actually, on the same DC) as has been configured by the Active Directory installation process. However, there are scenarios where an administrator would want to move one or more of the FSMO roles from the default holder DC to a different DC. The transferring method is described in the Transferring FSMO Roles article, while seizing the roles from a non-operational DC to a different DC is described in the Seizing FSMO Roles article.

In order to better understand your AD infrastructure and to know the added value that each DC might possess, an AD administrator must have the exact knowledge of which one of the existing DCs is holding a FSMO role, and what role it holds. With that knowledge in hand, the administrator can make better arrangements in case of a scheduled shut-down of any given DC, and better prepare him or herself in case of a non-scheduled cease of operation from one of the DCs.

How to find out which DC is holding which FSMO role? Well, one can accomplish this task by many means. This article will list a few of the available methods.

Method #1: Know the default settings

The FSMO roles were assigned to one or more DCs during the DCPROMO process. The following table summarizes the FSMO default locations:

FSMO Role Number of DCs holding this role Original DC holding the FSMO role
Schema One per forest The first DC in the first domain in the forest (i.e. the Forest Root Domain)
Domain Naming One per forest
RID One per domain The first DC in a domain (any domain, including the Forest Root Domain, any Tree Root Domain, or any Child Domain)
PDC Emulator One per domain
Infrastructure One per domain

Method #2: Use the GUI

The FSMO role holders can be easily found by use of some of the AD snap-ins. Use this table to see which tool can be used for what FSMO role:

FSMO Role Which snap-in should I use?
Schema Schema snap-in
Domain Naming AD Domains and Trusts snap-in
RID AD Users and Computers snap-in
PDC Emulator

Finding the RID Master, PDC Emulator, and Infrastructure Masters via GUI

To find out who currently holds the Domain-Specific RID Master, PDC Emulator, and Infrastructure Master FSMO Roles:

1.Open the Active Directory Users and Computers snap-in from the Administrative Tools folder.
2.Right-click the Active Directory Users and Computers icon again and press Operation Masters.
3.Select the appropriate tab for the role you wish to view.
4.When you're done click Close.

Finding the Domain Naming Master via GUI

To find out who currently holds the Domain Naming Master Role:

1. Open the Active Directory Domains and Trusts snap-in from the Administrative Tools folder.
2. Right-click the Active Directory Domains and Trusts icon again and press Operation Masters.
3. When you're done click Close.

Finding the Schema Master via GUI

To find out who currently holds the Schema Master Role:

1. Register the Schmmgmt.dll library by pressing Start > RUN and typing:
regsvr32 schmmgmt.dll
2. Press OK. You should receive a success confirmation.
3. From the Run command open an MMC Console by typing MMC.
4. On the Console menu, press Add/Remove Snap-in.
5. Press Add. Select Active Directory Schema.
6. Press Add and press Close. Press OK.
7. Click the Active Directory Schema icon. After it loads right-click it and press Operation Masters.
8. Press the Close button.

Method #3: Use the Ntdsutil command

The FSMO role holders can be easily found by use of the Ntdsutil command.

Caution: Using the Ntdsutil utility incorrectly may result in partial or complete loss of Active Directory functionality.

1. On any domain controller, click Start, click Run, type Ntdsutil in the Open box, and then click OK.

Microsoft Windows [Version 5.2.3790]
(C) Copyright 1985-2003 Microsoft Corp.

1. Type roles, and then press ENTER.
ntdsutil: roles
fsmo maintenance:

Note: To see a list of available commands at any of the prompts in the Ntdsutil tool, type ?, and then press ENTER.

Type connections, and then press ENTER.
fsmo maintenance: connections
server connections:

Type connect to server <servername>, where <servername> is the name of the server you want to use, and then press ENTER.
server connections: connect to server server100
Binding to server100 ...
Connected to server100 using credentials of locally logged on user.
server connections:

At the server connections: prompt, type q, and then press ENTER again.
server connections: q
fsmo maintenance:

At the FSMO maintenance: prompt, type Select operation target, and then press ENTER again.
fsmo maintenance: Select operation target
select operation target:

At the select operation target: prompt, type List roles for connected server, and then press ENTER again.
select operation target: List roles for connected server
Server "server100" knows about 5 roles
Schema - CN=NTDS Settings,CN=SERVER100,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=C
Domain - CN=NTDS Settings,CN=SERVER100,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=C
PDC - CN=NTDS Settings,CN=SERVER100,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Conf
RID - CN=NTDS Settings,CN=SERVER100,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Conf
Infrastructure - CN=NTDS Settings,CN=SERVER100,CN=Servers,CN=Default-First-Site-Name,CN=Si
select operation target:

Type q 3 times to exit the Ntdsutil prompt.
Note: You can download THIS nice batch file that will do all this for you (1kb).

Another Note: Microsoft has a nice tool called Dumpfsmos.cmd, found in the Windows 2000 Resource Kit (and can be downloaded here: Download Free Windows 2000 Resource Kit Tools). This tool is basically a one-click Ntdsutil script that performs the same operation described above.

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