With data in cells A1:A12, in the immediate window, I get:

? Range("A65536").End(xlUp).Row
12
? Cells(Rows.Count,"a").end(xlup).row
12
? Range("A" & Rows.Count).End(xlUp).Row
12
? Range("A:A").End(xlUp).Row
1

Why (in the last case) am I getting 1 ?
Thanks (in advance),