All Ultimaker printers have a serial number. The serial number sticker is located at the back of the machine, where the power cable is plugged into the unit.
Ultimaker serial numbers begin with 'BPP-' and contain two sets of 6 digits.
Note: Older printers, such as the Ultimaker 2(+) may have the serial number sticker on the bottom of the machine. Printers produced before 2016 have a different serial number format, and begin with 'UM2' or 'UMO'.