SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains offered across the .ru, .su, and .рф zones. The platform serves businesses and individuals seeking an online address for a website, brand, or personal project. Its listings include keyword domains and names in Russian, Latin transliteration, and related forms, with prices and available purchase or rental options shown for each listing.

Customers can buy domains online with immediate transfer or rent them by assigning their own DNS servers. Some rental arrangements include a guaranteed right to purchase the domain later. The marketplace provides search tools for finding domains by words and other parameters, and visitors can view or download the full inventory, including domain metrics. For selected names, the site displays information such as age, search-related figures, and ratings. Customers may also contact the marketplace to ask questions or suggest a price, with help and online chat available through its support section.