Hanrahan was named in the Emerging Ireland squad for the 2015 World Rugby Tbilisi Cup on 19 May 2015. He scored 5 points in Emerging Ireland's opening 25–0 win against Emerging Italy on 13 June 2015. He also started and scored 15 points off the tee in the 45–12 win against Georgia on 21 June 2015, a win which secured the tournament for Emerging Ireland.