SITE.su is an online marketplace specializing in premium domain names, offering more than 40,000 domains in the .ru, .su, and .рф zones. The service helps businesses and individuals find domain names suited to their brands, websites, or projects, with listings that include keyword-based names and related alternatives.

Customers can purchase domains online with immediate transfer of administrative rights, or rent them by arranging for their own name servers to be assigned. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the agreement. Rentals are priced by the calendar month, and agreements can run for up to 50 months.

The marketplace provides domain search tools, including expanded search options, and allows visitors to view or download the full domain list. Listings show purchase and monthly rental prices, along with details such as domain age and search-related indicators. Buyers can also contact the marketplace with questions or propose a price.