SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains, primarily in the .ru, .su, and .рф zones. Customers can browse, search by keywords or other parameters, view domain metrics, and download a complete catalogue in Excel. The service supports both immediate purchase and rental, with online ordering and contact options for questions or price offers.

Purchasing transfers administration rights to the buyer, while rental allows customers to use a domain by assigning their own DNS servers. Rental agreements include a priority right to buy the domain at a price fixed in the contract; the maximum rental term is 50 months. Prices are listed in rubles, with rental rates charged monthly. Domain listings may include registration age, search statistics, and a rating intended to indicate SEO appeal. SITE.su provides domains in Cyrillic and Latin spellings, including keyword-based names. The marketplace is designed for individuals and organizations seeking a domain for a website, business, or online project, with support and online chat available through its help section.