The DNI is the identity document used in Spain. Every citizen currently has an eight-digit number and a letter in his/her own.
Numbers between 4 and 9 were released, while those between 10 and 99 are reserved for the Spanish royal family. The first design of the DNI was created by Aquilino Rieusset Planchón, who won a public competition and received a prize of 30,000 pesetas. He also had a box that classified him according to his economic status in different categories.