All the questions about class rank are starting to annoy me. As far as I know, there are four ways to get your class rank. 1) If grades are published somewhere, you can copy everybody's grades into an Excel spreadsheet and sort by average. 2) You can ask your registrar for your rank 3) You can ask career services or the registrar for the ranking information for the last 1L class. Career services at my school has a letter that explains the curve to employers and includes an estimate of class rank. 4) You can ask a 2L about what the cut-offs were for each rank. They probably know.
Other than that, curves vary so much that you will not know what your rank is just by comparing to other people on this board.