Since its relaunch nearly two years ago, the List of Church of Ireland Parish Registers has been regularly maintained by staff at the Representative Church Body Library, and the most recently updated version is now available to download.
Parish by parish, the 97-page document pdf (2.1Mb) lists the registers that have been lost, and the registers (and the dates they cover) that have survived, and sets out details of where the latter, in copy/transcript or microfilm format, may be held or accessed.
There are also links to online sources, as well as to parish handlists which provide more specific information about each parish.
It's an essential reference for Irish genealogists. And it's free.
You can download the April 2018 version of the List of Church of Ireland Parish Registers here.