Knowledge expansion:
Resident ID number refers to the unique and life-long valid identity code compiled by China people and China residents from the date of applying for residence permit, which is widely used to handle the rights and interests related to the political, economic and social life of China people and China citizens.
The citizenship number is a feature combination code. It consists of a 17 bit digital ontology code and a 1 bit digital check code. From left to right, the sequence is: the first six address codes, eight birth date codes, three serial codes and one check code.