ISREF(value)
=ISREF(A1)
The function evaluates a single cell reference or a range of cell references, and returns TRUE if a reference is found, and FALSE if not. For example, this returns TRUE if A1 contains a reference and FALSE if not.
=ISREF(A1:C1)
The function can also be used to evaluate a range of cell references. For example, this returns TRUE if A1:C1 contains a reference and FALSE if not.
=ISREF(Sheet1!A1)
The function can also be used to evaluate a reference in a different worksheet. For example, this returns TRUE if the reference in A1 is in Sheet1 and FALSE if not.
=ISREF("apple")
The function does not evaluate the contents of a reference. For example, this returns FALSE because ISREF does not evaluate the contents of a reference.
The ISREF function tests a value and returns a boolean result depending on the outcome. It can be used to determine if a value is a valid reference or not.