Check your Demat account statement or welcome kit from your broker or depository participant
Log in to your broker’s trading or Demat account app or website
Go to the profile, account details, or holdings section
Look for the Demat account number or Beneficial Owner ID
Check your email for account opening confirmation or welcome messages
Check SMS messages from your broker or depository participant
Contact your broker’s customer support
Contact your depository participant branch
Verify through NSDL or CDSL account details if available in your records
Check your physical account opening documents and contract note papers