OK158 Practical Queries is an online information and utility portal operated by Beijing White List Technology Co., Ltd. It brings together a broad range of free reference tools and practical calculators for everyday life, learning, finance, travel, and web development. Visitors can check IP address locations, mobile number regions, postal codes, identity card information, train schedules, license plate codes, and calendar dates, as well as access time and holiday references.

The site also offers financial tools for home-purchase, tax, and personal finance calculations; unit converters; age, health index, and date-difference calculators; and stock market information. Language and entertainment resources include dictionaries, translation, simplified and traditional Chinese conversion, idiom and proverb collections, riddles, quotations, tongue twisters, and dream interpretation. For web users and administrators, OK158 provides tools for WHOIS and domain checks, code formatting and conversion, encoding and decoding, favicon creation, regex testing, and other site utilities.

Its extensive directory organizes these services into convenient categories, making the platform a versatile destination for quick online lookups and simple tasks