BOID is a unique 16 digit identification number given to BO which is generated only when BO opens the demat account in CDSC through an authorized DP. BOID must be mentioned in all future transactions. BOID cannot be duplicate. It means two BOs cannot have same BOID which replicates that the securities cannot be transferred into the wrong account. BOID has two sections: DPID and Client ID. The first 8 digits represent the DPID and last 8 digits represent the Client ID.