This is an application which searches for Japanese postal numbers. From postal number to address, from a part of the address, be able to search for the postal number offline faster. Also be able to search for the data of the addresses of the companies that have many postals unlike general/common addresses. Will search from within 145,000 address data. The numbers will be searched via matching a sub-string with the beginning of the field, while the address will be searched via part matching the「漢字」(kanji) or the「よみがな」(yomigana). For the address, it can be searched with AND, like for example,「とう きょう」and「ちよだく」. Searching method is easy. If you place numbers then it will automatically decide to search for the numbers; if you place the address, it will automatically decide to search for addresses. For AND-search, input several parts of addresses with「,」or「、」as separators. For example, if「とうきょう、ちようだく」,it will search addresses that match both「とうきょう」and「ちよだく」. From the search results, you can be able to copy the postal numbers or the addresses to the clipboard. Moreover, you can be able to display the searched address through a map application. For the postal number data, a Japanese postal site or the latest data will be acquired and saved in the application. After saving, you can still search even if you're not connected to the network. There is also a notification function that notifies updates in postal number data, so you can always be able to acquire the latest data.