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 browse keyword-focused domains, compare listings, and purchase or rent names directly online. Purchases include an immediate transfer of domain administration rights, while rentals allow customers to assign 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 search tools for finding domains by word or other parameters, as well as options to view or download the full domain list. Listings include details such as purchase and monthly rental prices, domain age, and an SEO-oriented rating based on search data and keyword indicators. Customers can contact the seller with questions or propose a price, and the site offers help, account access, and online chat.