SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains across the .ru, .su, and .рф zones. The service helps businesses and individuals find keyword-based domain names and purchase or rent them online. Buyers can complete a purchase with an immediate transfer of domain administration rights, while rental customers can use their own DNS servers. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the contract; agreements can run for up to 50 months.

The marketplace provides domain search tools, including advanced filters, a full-list download, and domain information such as age and an SEO-oriented rating based on Yandex Wordstat and search-engine keyword indicators. Customers can submit questions or offers on individual domains, and the site directs users to its Help section for contacts and online chat. SITE.su presents domain acquisition and rental as options for building an online presence, with listings that include prices for both purchase and monthly rental.