The system of citizenship registration was established by the Irish Nationality and Citizenship Act, 1956. A person born outside Ireland to an Irish-citizen parent who was also born outside Ireland may acquire Irish citizenship by registering onto the Foreign Births Register or a Foreign Births Entry Book.
The system for citizenship registration, as defined in the 1956 Irish Nationality and Citizenship Act, allows individuals born outside Ireland to an Irish-citizen parent who was also born abroad to acquire Irish citizenship by registering their birth on the Foreign Births Register or a Foreign Births Entry Book.