I know how to know the first 14 bits of the ID number behind the

Identity card number of the first six for the administrative code, the middle eight is the date of birth code, how many birthdays, the eight digits is how much, such as January 1, 1997 was born, is 19970101, fifteenth to seventeenth is the order of the number, randomly generated, in addition to the seventeenth on the number of male singles, female doubles, there is no law, eighteenth number for the check digit, the number will be the first 17 digits of the number of the formula into the calculations The result of the calculation is 0-10,10 with X instead.

Additionally, the citizen's ID number is unique and remains unchanged for life, and will not be changed without a wrong number and a duplicate number. Even if you move your household, the first six digits of the area code do not change.

Your question cannot be answered, if you need to check someone's ID number, you need to have a valid reason and fulfill the formalities to inquire at the public security authorities.

Added, 621100 this administrative code should have a problem, this is the code of Gansu Dingxi, but a person's ID card number the first six must fall to the county district (county-level city), it is not possible to only to the prefecture-level city, so the ID card will not appear on the 621100 this code can only appear in the code of the county district.

621102 Anding District

621121 Tongwei County

621122 Longxi County

621123 Weiyuan County

621124 Lintao County

621125 Zhang County

621126 Min County