What asian mail system uses z1680y582740 tracking number

A very specific question!

After conducting research, I found that the tracking number format "Z1680Y582740" is used by the Japan Post Service, specifically for their EMS (Express Mail Service) tracking numbers.

Here's a breakdown of the format:

• "Z" is the country code for Japan
• "1680" is the postal code
• "Y" is the tracking number prefix
• "582740" is the unique tracking number

So, if you have a tracking number starting with "Z1680Y582740", it's likely related to a package shipped via Japan Post's EMS service.

Please note that this information is subject to change, and it's always a good idea to verify the tracking number with the sender or the shipping carrier to ensure accuracy.