The Irish Rugby Football Union (IRFU) is the body managing rugby union in the island of Ireland (both Republic of Ireland and Northern Ireland). The IRFU has its head office at 10/12 Lansdowne Road and home ground at Aviva Stadium, where adult men's Irish rugby union international matches are played. In addition, the Union also owns the Kingspan Stadium in Belfast, Thomond Park in Limerick and a number of grounds in provincial areas that have been rented to clubs. - Source: Wikipedia
