Vehicle registration plates of the Republic of Ireland

In Ireland, vehicle registration plates (commonly known as "number plates" or "registration plates") are the visual indications of motor vehicle registration which has been mandatory since 1903 to display on most motor vehicles used on public roads in Ireland. The alphanumeric marks (or "registration numbers", officially termed "identification marks") themselves are issued by the local authority in which a vehicle is first registered.

Source: Wikipedia — Vehicle registration plates of the Republic of Ireland (CC BY-SA 4.0)