验证器
信用卡验证工具
使用 Luhn 算法验证卡号、识别卡组织（Visa、Mastercard、Amex...）并格式化，全部在浏览器中完成
此工具仅检查卡号的数学正确性，不会验证卡是否真实存在、是否有效或是否有余额。全部在浏览器中运行，不会发送任何数据。
常见问题
常见问题
关于信用卡验证你需要了解的一切
什么是 Luhn 算法？
The Luhn algorithm (or mod 10 formula) is a simple checksum used to validate identification numbers such as credit cards, IMEI codes and others. It doubles every second digit starting from the right, sums all the digits and checks that the total is a multiple of 10.
如何识别卡组织？
The network is detected from the first digits of the number (the IIN/BIN). For example Visa cards start with 4, American Express with 34 or 37, Mastercard with 51-55 or 22-27, Discover with 6011 or 65. Each network also has specific valid lengths (Amex has 15 digits, most others 16).