Irish Naturalisation and Immigration Service Irish Naturalisation and Immigration Service Irish Naturalisation & Immigration Service (INIS) is the Irish government service responsible for visas, citizenship, immigration and asylum.INIS also administers the functions of the Minister for Justice and Equality in relation to the above Opening Hours Tuesday 8am – 9pmWednesday 8am – 9pm Thursday 8am – 9pm Friday 8am – 6pm Saturday 8am – 6pm Sunday Closed Monday 8am – 9pm CALL NOW +353 1 456 2895