The top three remains unchanged, but the Boys in Green have risen one place, while Northern Ireland plummet to 119th
Giovanni Trapattoni's Boys in Green drew with Sweden and Austria in World Cup qualifiers in March and now find themselves ahead of Serbia and Tunisia in the rankings.
The top three remains unchanged, with Spain in first place, with Germany and Argentina occupying second and third place respectively. Ireland's Euro 2012 opponents Croatia have risen five place into fifth place, while England have fallen out of the top five into seventh place.
Ireland World Cup qualifying opponents Sweden dropped three places to 24th, while Austria rose eight places to 71st.
Northern Ireland, meanwhile, fell a total of 22 places and find themselves ranked 119th, while Scotland fell 11 places to 77th. Wales, however, rose to 49th, a jump of 22 places.