Vehicle registration plates of the Republic of Ireland Vehicle registration plates of the Republic of Ireland In the Republic of Ireland, vehicle registration plates (commonly known as "number plates") are the visual indications of motor vehicle registration – officially termed "index marks" – which it has been mandatory since 1903 to display on most motor vehicles used on public roads in Ireland. The alphanumeric marks (or "registration numbers") themselves were issued by the local authority in which a vehicle is first registered. The current specification for number plates is the format YYY–CC–SSSSSS. Those issued from 1987 to 2012 had the format YY–CC–SSSSSS. The components are: Since 1991, the
Vehicle registration plate inserted by the vehicle service centre or the dealership from which the vehicle was purchased. Vehicle owners can also purchase customized frames to replace the original frames. In some jurisdictions registration plate frames are illegal or have design restrictions. For example, many states, like Texas, allow plate frames but prohibit plate frames from covering the name of the state, province, district, Native American tribe or country that issued of license plate (when that information appears on the plate). Plates are designed to conform to standards with regard to being read by eye in day or at night, or by electronic