Postal savings tail number is divided into four parts.

Postal savings is one of the financial service institutions under China Post Group Corporation, providing customers with financial services such as savings, payment and settlement, and credit. Personal bank accounts in China usually include 14 digits, where the suffix refers to the last four digits of the account. These four digits are usually used to identify the personalized characteristics of the account, and different tail numbers represent different account identities, which is convenient for identifying and managing the account.

Postal savings suffixes are divided into the first 10 and the last 4 digits of the account number. The top ten usually represent the basic information of the account, including the bank, area code and other information. The last four digits are the account number, which is used to distinguish the accounts of different customers. The tail number is often considered as relatively private information, which can be used to verify the authenticity of the account and can also be used as a simple identification.