便民查询网, formerly known as 51240便民查询网, is a Chinese online service offering a broad collection of convenient lookup tools and practical resources. Its website organizes services into categories including everyday life, computers and networking, calculations, language and writing, health, website development, and entertainment. Users can look up phone number locations, postal codes, time zones, weather, exchange rates, administrative divisions, and other reference information. The site also provides calculators for loans, taxes, dates, unit conversions, health-related estimates, and more.

For digital tasks, its tools include IP and domain lookups, network speed testing, password and UUID generation, QR-code creation, file hash calculation, image processing, audio conversion, and screen recording. Language resources include dictionaries, idiom references, pronunciation conversion, and online input methods. Additional content covers health information, cultural references, puzzles, and leisure activities. The site describes its services as free online queries and tools, with contact and interface-calling information also provided.便民查询网 is designed as a centralized destination for quick, self-service access to a wide variety of information and utilities.