When you generate a Ripple (XRP) deposit address for your Kraken account, a unique and mandatory ‘Destination Tag’ is also generated. 

The Destination Tag is used to determine what account a deposit should be assigned and credited to. This is because all Kraken accounts share a single Ripple (XRP) deposit address:

rLHzPsX6oXkzU2qL12kHCH8G8cnZv1rBJh

The Destination Tag is ten numbers long and must be included with all Ripple (XRP) deposits to your Kraken account. An example Ripple (XRP) Destination Tag is:

0123456789

Always ensure to include the correct Destination Tag before sending your XRP deposit.

WARNING: Forgetting to include the Destination Tag will lead to significant delays in crediting the deposit to your account, and might even make the deposit irretrievable in certain cases.