17track is not always useful, there are still some international couriers they don't support. For example, they don't support dtdc, CDEK, and Aliexpress standard shipping. So sometimes we need some 17track alternationve tracking sites.
A List of 17track alternative tracking site1. Trackingmore.
Thackingmore is a global package tracker support 410 couriers, including dhl/ups/China post .
This site is powered by Alibaba Group. Support 70 couriers, most of them are postal site and China express company such as 4px, yanwen.
Packagetrackr support 33 couriers till 2017/5/26. Many people use this tracking sites because they can also check many comments of courier here.
This is a Russian site which only support Russian Language. Most of the user are in Russian speaking countries.
Except these sites, there are still some alternative sites: