Registration of cars with modern or current of three letters and four numbers in Spain began in September of 2000. Until that date the cars enrolled first putting the letter or letters of the Spanish provinces, followed by 4 numbers and ending by one or two letters according to the level of registrations that had each province and logically in places like Madrid and Barcelona lelgaron to have these two letters at the end. Until that date and on the principles of vehicle registrations, is towards putting the letter in the province first and followed by a number until it reaches 1 million which was when it was decided to pass to the system of letters at the beginning and at the end because in provinces of lot sale of cars the system ran. Consultation of registrations of cars is very common in internet since knowing the date of registration of this self, is known the years old when we are interested in buying a car from that era. Logically, this should not be the only information since you can now put a registration new for example when we buy a car from Germany or import, and even if we want to change of registration in which case, we must change the province of domicile and new MOT. Follow-up to the letters of registration also can serve to determine the level of selling cars that occurs in each month as you can see in the link that we showed at the beginning about registrations of cars. For example, if in October 2005 letter rotated 20 times, in October of this year 2.010 just has been 8 times which shows the great fall that occurred on sales where it is possible that SUVs or 4 4 have been the most affected by the cost of the registration tax. Original author and source of the article..