The rules for the preparation of passport numbers vary from country to country/region. The following are examples of passport numbers and brief rules for some common countries and regions. It should be noted that the specific rules may be adjusted over time, and some details may be official secrets. The following information is based on public information.： --- ### **1. Chinese ordinary passport (E-passport with E-prefix)** -**Example**:`E12345678` -**Rules**： -**Prefix**: The new version of the e-passport starts with a capital letter `E` (`G` or `P` were used in the early days). -**Digital part**: Usually 8 digits (7 digits in a few cases), which are allocated by the system in order, and there is no public verification algorithm. --- ### **2. U.S. passport** -**Example**:`123456789` -**Rules**： -**Pure numbers**: Usually 9 irregular consecutive numbers, randomly generated (may contain letters in the early stage). -**Privacy protection**: There is no public verification rule to avoid disclosing personal information. --- ### **3. EU countries (such as Germany)** -**Example**:`C01X00T47` -**Rules**： -**Mixed characters**: 9 common digits, may contain a combination of letters and numbers. -**Country code**: Some contain hidden country identifiers (for example, German passports may contain 'D`). --- ### **4. Japanese passport** -**Example**:`MA123456` -**Rules**： -**Prefix**: The letters 'MA`, 'MB`, etc. represent the passport type (ordinary/official). -**Number part**: 6 or 7 digits, issued in sequence. --- ### **5. Indian passport** -**Example**:`A1234567` -**Rules**： -**Prefix**: The letters 'A`, 'F`, etc. indicate the passport category (ordinary/official). -**Number part**: 7 or 8 digits, randomly assigned. --- ###**Commonalities of generation methods** 1. **Uniqueness**: Ensure that each passport number is unique in the world. 2. **Anti-counterfeiting design**: Some countries may embed check codes or hide logos. 3. **No personal information**: Modern passport numbers generally do not directly contain data such as place of birth, birthday, etc. --- ###**Precautions** -**Privacy risk**: The passport number is sensitive information, so do not disclose the real number in the example at will. -**Dynamic adjustment**: Countries may update the rules from time to time (for example, China launched an electronic passport with the prefix `E` in 2012). -**Official channels**: If you need authoritative information, it is recommended to consult the passport issuing agencies of various countries (such as the China Entry-Exit Administration). If you need more detailed rules for a specific country, you can further explain.