The Republic of Ireland have risen to 29th in the world rankings, just behind Northern Ireland, who have edged up to 28th.
Martin O'Neill's men - 42nd back in November - have now leaped 13 places after Euro 2016 qualification wins against Gibraltar, Georgia and World Cup holders Germany were followed up the play-off disposal of Bosnia-Herzegovina.
The North have been nudged up one place as the effects of their incredible topping of Group F continue to resonate.
Belgium, Ireland’s Group E rivals in France, remain the No 1 side on the planet ahead of Argentina and Spain.
Italy have crept up to 15th, while Sweden, Ireland’s other group stage opponents, are 34th.
Roy Hodgson's England are as they were in ninth, with Wales still 17th and Scotland up one spot to 45th.
FIFA World rankings
28 Northern Ireland
29 Republic of Ireland