To improve mail processing efficiency in Taiwan, Chunghwa Post release a new 3+3 postal code system from March 2020.
The first 3 codes "Administrative Region Code" remain unchanged,
The last 3 yards "delivery section code" increased from the original 2 character to 3.
To improve the efficiency of mail sorting, and improve the accuracy of delivery.
Therefore, everyone in Taiwan should start using the 3+3 postal code/ZIP to send letters.
This APP is specifically used to query 3+3 zip postal code in Taiwan.