Code:
lastrow = Cells(Rows.Count, 1).End(xlUp).Row
lastcol = Cells(1, Columns.Count).End(xlToLeft).Column
For j = CInt(col) To lastcol Step 2
For i = 1 To lastrow
If IsEmpty(Cells(i, j).Value) Then
Cells(i, j).Value = "Not in Scope"
End If
Next i
Next j