How can I check the status of the Relative Identifier (RID) pool on a domain controller

A. Windows gives every DC a pool of RIDs and adds to the pool as necessary in batches of 500. To check the range of RIDs in a current pool, run the command

dcdiag /v /test:ridmanager

where /v specifies verbose mode and /test:ridmanager tells the command to run only the RID Manager test and not the other default tests.

The command displays the next RID that will be allocated to an object created on the DC and the range of currently allocated RIDs, as in the following sample output:

C:\Program Files\Support Tools>dcdiag /v /test:ridmanager

Domain Controller Diagnosis


Starting test: RidManager
* Available RID Pool for the Domain is 2608 to 1073741823
* DC2.tnls.com is the RID Master
* DsBind with RID Master was successful
* rIDAllocationPool is 1108 to 1607
* rIDPreviousAllocationPool is 1108 to 1607
* rIDNextRID: 1112
......................... DC1 passed test RidManager

In this example, the range of RIDs that can be allocated is from 1108 to 1607, and the next RID that will be allocated is 1112