Japan Post’s official website explains postal and parcel services in Japan and provides tools for looking up addresses and postal codes. Visitors can search by region, enter an address, or start with a postal code, and businesses can look up dedicated seven-digit office codes. The site calculates domestic prices for letters, postcards, and Yu-Pack parcels, and provides rates and delivery estimates for international mail and EMS. Users can also find post offices, ATMs, and mailboxes, track parcels, request redelivery, and check service or delay information. Business resources include downloadable postal-code data and an official API for postal codes and digital addresses.