China postal express single number query, why not?

There are two kinds of China postal express number, one is mail tracking query, and the other is EMS postal express. The inquiry address is as follows:

/zdxt/yjcx/

/

If the query is wrong, check whether there is a single number error. If it's not a single number problem, you can contact the seller (that is, the shipper) for specific logistics information, or directly consult the customer service of official website Post Express.