Replying to [int786]:the contre no is consist of 4 letters(the fourth letter is U always) + a serials number .if the contre belongs to the steamship company,you can judge the steamship company by the first 3 letter of contre no .such as MSKUxxxxxxx,it's steamship company is MSK,so you can track its information on the website of MSK. APLUxxxxxxxx,that's the container of the APL,ect,
But if the contre is rented by steamship company,you can not judge it by the contre no,at this time you'd better to ask your supplier to provide shipping information.