SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains across the .ru, .su, and .рф zones. Customers can browse available names, search by keywords or other parameters, view a full inventory, and download domain listings. The marketplace supports both immediate purchase and monthly rental, with online ordering through its shopping cart and help available through a contact section and online chat.

Purchasing a domain transfers its administration rights to the buyer. Rental allows customers to assign their own DNS servers; rental agreements include a priority right to buy the domain during the contract, with the purchase price fixed in advance. Rental periods can extend up to 50 months. The site also invites customers to ask questions or submit offers on individual names. Listings may include purchase and rental prices, domain age, and search-related indicators. SITE.su presents its services as a way for businesses and projects to secure a suitable web address through either ownership or a lower-cost rental arrangement.