Is there a mantissa in the ID number?

The tail number of the ID card is the same.

The first few digits of the ID number are the codes of provinces and cities, the middle is your date of birth, followed by the identification code (because there will be many people in the same city on the same day). The mantissa of the ID number will be the same, but one in 100,000 must belong to other urban areas. The reason why it is said to be one in 100,000 is because before the Internet age, our country's ID card information was filled in by hand, which means that there will be mistakes in filling it in. Up to now, we have two or even three ID cards with the same number.