Although sort codes in both countries have the same format, they are regulated by different authorities as each country has its own banking system. Sortcodes are unique to the British and Irish banks for internal money transfers. Enter full or partial sortcode or clearing house to display any available data.
Also, sort codes for Northern Ireland branches of banks registered in both Northern Ireland and the Republic, are valid, and recognized for use in the Republic. The Extended Industry Sorting Code Directory (EISCD)
The EISCD is a comprehensive database of payments-related information for financial institutions participating in the UK Payment Schemes: Bacs, CHAPS, Faster Payments and Cheque and Credit Clearing. Money being transferred across international borders, the international network is used.