Posted in Web LPT: The first six digits of a UPS tracking number after 1Z … – Reddit August 17, 2024 LPT: The first six digits of a UPS tracking number after 1Z = the shipper’s account number, if you need to return at shipper’s expense. https://www.reddit.com/r/LifeProTips/comments/1r81rp/lpt_the_first_six_digits_of_a_ups_tracking_number/