Event ID 16647 — RID Pool Request

Applies To: Windows Server 2008

Users, computers, and groups stored in Active Directory are collectively known as security principals. Each security principal is assigned a unique alphanumeric string called a SID. The SID includes a domain prefix identifier that uniquely identifies the domain and a relative identifier (RID) that uniquely identifies the security principal within the domain. The RID is a monotonically increasing number at the end of the SID.

Each domain controller is assigned a pool of RIDs from the global RID pool by the domain controller that holds the RID master role (also known as flexible single master operations or FSMO) in each Active Directory domain. The RID master (also known as the RID pool manager, RID manager, or RID operations master) is responsible for issuing a unique RID pool to each domain controller in its domain. By default, RID pools are obtained in increments of 500. Since RIDs are 30 bits in length, a maximum of 1,073,741,824 (230) security principals can be created in an Active Directory domain. Newly promoted domain controllers must acquire a RID pool before they can advertise their availability to Active Directory clients or share the SYSVOL. Existing domain controllers require additional RID allocations in order to continue creating security principals when their current RID pool becomes depleted.

Event Details

Product: Windows Operating System
ID: 16647
Source: SAM
Version: 6.0
Message: The domain controller is starting a request for a new account-identifier pool.


This is a normal condition. No further action is required.

RID Pool Request

Active Directory