Reverse Lookup
Useful for shipping forms, address checks, and form completion when one code maps to multiple areas.
Postal Code Query
Look up regions by postal code or find postal codes by address keywords for shipping forms, data checks and daily use
This tool sends a request to the server to search the built-in postal code database without calling any third-party address lookup service.
Query Settings
Best for reverse lookup when one postal code maps to multiple districts or streets.
Results
Choose a mode, enter a query, and start searching.
Tips
Keyword Search
Search by province, city, district, street, neighborhood, or landmarks to find matching postal codes.
Data Source
Results come from the built-in postal code dataset included in this project for everyday lookups and data cleanup.
Documentation
Overview
Postal Code Query supports two search modes: reverse lookup by postal code and postal code search by address keywords. It is useful for shipping forms, form completion, customer data cleanup, and everyday lookup tasks.
Key Features
- Reverse lookup province, city, district, and street details by 6-digit postal code
- Search postal codes with province, city, district, and street keywords
- Display multiple matches and copy one item or the full result list
- Run with security verification and the built-in postal code dataset from this project
How to Use
- Choose the code-to-address or address-to-code tab
- Enter a 6-digit postal code or address keywords such as province, city, district, or street
- Start the search and copy the record you need from the results list
FAQ
Why can one postal code return multiple results?
One postal code can cover multiple streets, districts, or address ranges, so multiple related records may be returned.
What should I do if address keyword search returns nothing?
Try shorter and more common keywords first, especially province, city, district, or street combinations.
Where does the query data come from?
The results come from the built-in postal code data file included in this project and do not rely on a third-party address lookup API.