The DEMAT Account Number is a 16-digit number. Eg: 12081800 00123456. The first 8-digits of this number are the DP ID and the last 8-digits are the Client ID. You'll also get your DP ID when your account is opened with Upstox. 

If you’re using an older version of the Upstox app.

Below are steps to check your demat account number with Upstox.

Step 1: log into your Upstox account from your mobile and go to the 'Profile' Section.

Step 2: Click on 'My Account'.

Step 3: Click on "My contact details".

Step 4Check your Demat account number with Upstox.

Step 5: This is how you can check your demat account number in the old Upstox app.