The numbers provided below are for example reference only and are not actual account information of any real bank. In actual system design and testing, the generated numbers should comply with the format, length and checksum rules specified by each target country or bank. The following examples are divided into two categories: ──────────────────────────────── 【I. Examples of pure digital Chinese bank account numbers】 The account numbers of many banks in China are usually composed of 16 to 19 pure digits. There is no unified international standard for the format, and each bank specifies it. Here are some examples of common lengths: 1. 16-digit example: 1234567890123456 2. 18-digit example: 621483560123000123 3. 19-digit example: 6228480402564890018 Note: The above numbers are randomly constructed and have not been calculated using the actual "check digit". They are only used to show the length and format of the numbers. ──────────────────────────────── 【II. Examples that comply with international standards (IBAN)】 IBAN (International Bank Account Number) is composed of a country code, a check digit, and bank and account information. Its format and check digit need to be calculated using a specific algorithm. Here are some examples of IBANs from common countries (these examples often appear as examples in public documents, and the check digit has been generated according to the algorithm): 1. German IBAN: DE89370400440532013000 Description: Country code DE, check digit 89, and the subsequent part is the bank identification number and account number. This number often appears in international examples. 2. British IBAN: GB29NWBK60161331926819 Description: Country code GB, check digit 29, NWBK is the code for a specific bank; this number is often used in public examples. 3. French IBAN: FR1420041010050500013M02606 Description: Country code FR, check digit 14, followed by bank and branch code and account number. The example is from public test data. ──────────────────────────────── 【Tips】 • If you need to generate real and usable account numbers in the system, you should select the rules of the corresponding country or bank according to the actual business, and construct and verify them in accordance with: ① Fixed length requirement ② Combination rules of each part (such as bank code, branch code, account number, etc.) ③ Check digit (such as IBAN's check digit or some bank-specific algorithms). • In the above examples, the pure numeric account number only reflects the possible formats, while the IBAN example already includes the check digit calculated by the check algorithm to ensure that its format is "correct" - but please note that these numbers are only used for testing and demonstration and cannot be used directly in a real environment. I hope the above examples can help you with your design and testing! If you need more specific rules or customized generation algorithms, please feel free to communicate further.