Express delivery number is the unique identification code of express package, which contains the detailed information of the recipient's express mail, usually consisting of numbers and letters. The courier number can facilitate the courier company, the sender and the recipient to track the courier information in real time.

The courier number is generally composed of letters and numbers, and the format of the courier company that does not pass is different. An express order number such as Tong Yuan's order number consists of alphanumeric characters of 10, and usually starts with 1**, 2**, 8** or D**. The order number was upgraded from 1 0 to 12 on June 20 14.