Check your Demat account opening welcome letter or account statement
Log in to your broker’s trading or demat portal
Open the account details, profile, or holdings section
Look for the Client ID, Beneficiary ID, or Demat Account Number
For NSDL accounts, the Demat account number is usually a 16-digit alphanumeric ID
For CDSL accounts, the Demat account number is usually a 16-digit numeric ID
Check the email or SMS sent by your broker or depository participant after account opening
Contact your broker’s customer support or depository participant
Use the mobile app of your broker to view account details
Check your physical account statement or DIS booklet if provided