Hi snl003!
That is something you would have set up with your broker. Most accounts are set up to sell the oldest lots first, but they would be able to confirm that with you. The IRS doesn't make any designation on that, they just take the information as the broker reports it.
Hope that helps!
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"