When you create a Ripple (XRP) deposit address under your Kraken account, a unique ‘Destination Tag’ is also generated. This tag is an extra piece of information that can be included when sending a Ripple transaction.
On Kraken, the Destination Tag is used to determine what account a given transaction should be assigned and credited to. This is because all Kraken accounts use a single Ripple deposit address
The Destination Tag is ten numbers long and has to be included with all Ripple (XRP) deposits to your Kraken account. An example Destination Tag is:
Always ensure to include the correct Destination Tag before sending your XRP deposit. Leaving out this information will lead to significant delays in crediting the transaction to your account, and can be irretrievable in certain cases.