To find out which bank is associated with a sort code, you can use a sort code checker tool. There are several such tools available online, including those provided by Sort Codes, Starling Bank, Statrys, Bacs, and Unified Software. These tools allow you to enter the six-digit sort code and receive information about the bank or branch associated with it, such as the bank name, branch, address, and payment and clearing system information. Some tools also allow you to validate the sort code and account number combination online via modulus check. You can find your own sort code on your bank statements, debit card, or online banking account or mobile app.