How Many Different Irish Accents Are There?

I've thought long and hard about this. I think there are probably about 24 or 25 different Irish accents. I'm hoping that non Irish speakers can tell the difference between all the accents this guy in the video below does (my kids can't tell all of them apart and can't understand half of what he says (which is fortunate because a lot of it is in Irish street demotic which, naturally, includes a lot of swearing)). I think he does a brilliant job here with Republic of Ireland accents however he drops the ball a bit when he comes to Ulster. He only does 1 accent for all of Northern Ireland. By my reckoning there are at least 9 different Ulster/northern Irish accents that are quite distinctive: Derry, West Belfast, Camp West Belfast (Julian Simmons), North Belfast, South Belfast/North Down (the posh BBC accent), Ballymena, Newry, Tyrone/Fermanagh. Some day I'll make a video of me doing all 9 Northern Irish accents but for now here's Richie Stevens doing his 15 regional Irish accents: