The Nike identification certificate is on the tongue of the shoe. There is usually an anti-counterfeiting label inside, as well as an anti-counterfeiting code. You can check it on the official website. Each model of NIKE shoes will be assigned a nine-digit, unique number. From these nine numbers, we can get some information about this pair of shoes. The arrangement of these nine numbers is based on the arrangement of the first six and the last three. The front and rear groups are separated by a horizontal line, such as: 830142-101 (front and rear groups). The six digits of the front group can be divided into three parts: 830218 (front and rear digits).