There used to be Temp IRP as you used to have to name the states you wanted to operate in and would need a temp to go to a state not on your IRP B U T now they give you all 48 States on your registration which cut out a lot of confusion.
Uncle J J Keller would know.
Don't get IRP and IFTA unless there is NO other way!
No need to take on the reporting process when a few dollars of temp permits will work.