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 service enables customers to purchase a domain or rent it, including arrangements that provide a guaranteed priority right to buy later. Purchases can be completed online with immediate transfer of domain administration rights, while rentals allow customers to assign their own DNS servers. Rental terms and the buyout price are set out in an agreement, with contracts available for up to 50 months.

Customers can browse the full domain catalogue, download listings as an Excel file, or use advanced search to find names by keywords and other criteria. Domain pages provide pricing and selected information such as registration age and search-related indicators. Buyers and prospective renters can submit questions or price offers through the site, and assistance is available in its Help section, including online chat and contact details.