Answer by
LeheckaG (1826)
"Sort code" usually refers to a 6-digit (12-34-56) Bank & Branch number used to route funds within the United Kingdom & Ireland;
and included in IBAN ISO 13616:1997/13616-1:2007 International_Bank_Acount_Number used by European_Union international transfers.
Non-IBAN international transfers use BIC ISO 9362 Bank_Identifier_Code & BBAN Basic_Bank_Account_Number; sort-codes are not included in but translate into BICs.
Equivalent of a U.S. routing/transit code.