OnTrac 追踪号码格式和校验和
我正在开发一个运输 跟踪号码 库，并希望添加对 OnTrac。
根据一些样本编号（例如C10999911320231、C10999606576777、C11001105367744），格式似乎是后面跟着C由 14 位数字组成，其中第一个数字始终是 1。还有其他格式吗？
似乎还有一个校验和，因为 Google 只能识别某些变体（例如，C10999911320231 有效，但 C10999911320232 无效）。我尝试了各种算法但无法解决。校验和是如何计算的？
I'm working on a shipping tracking number library and would like to add support for OnTrac.
Based on some sample numbers (e.g. C10999911320231, C10999606576777, C11001105367744), the format seems to be a C followed by 14 digits, where the first digit is always a 1. Are there other formats?
There also appears to be a checksum, as Google only recognizes certain variations (e.g. C10999911320231 works, but C10999911320232 does not). I tried various algorithms but couldn't work it out. How is the checksum calculated?
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跟踪号码是
C后跟 14 位数字，其中最后一位数字是校验位。校验位计算与 UPS 相同，包括转换C到4。感谢 OnTrac 的 Danielle 提供此信息。A tracking number is a
Cfollowed by 14 digits, where the last digit is the check-digit. The check-digit calculation is identical to UPS, including converting theCto a4. Thanks to Danielle at OnTrac for providing this information.现在，OnTrac 追踪号码也可能以
D开头。为了计算校验位，在计算校验位之前需要将D替换为5。请参阅此处和此处获取计算校验位的示例代码。
Now it's also possible that an OnTrac tracking number starts with
D. To calculate the check digit,Dneeds to be replaced with a5before calculating the check digit.See here and here for sample code to calculate the check digit.