Covers the period 1814-1855. In association with the National Archives of Ireland.
https://familysearch.org/search/coll...ection/1804886
As far as I can see, it doesn't include County Antrim.
Also only 2 parishes of County Down, 3 of County Armagh, 3 of County Fermanagh. So, very little of Northern Ireland but it looks as though the coverage of the Republic is more or less complete.
Let us know what you find!