A hull number is commonly known as a WIN-number (Watercraft Identification Number) or HIN – / CIN-number. This number exits of 14 characters, including the country code on the first two positions. (example: NL-ABC1234a818). The hull number can generally be found on the right-hand side of the vessel’s mirror. For jet ski’s or water scooters the hull number is generally displayed underneath the fender.