SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains, primarily in the .ru, .su, and .рф zones. Customers can browse listings, search by keyword or other criteria, view a complete catalog, or download domain data in Excel format. The marketplace supports both outright purchases and monthly rentals, with listed prices and information such as domain age and search-related indicators to help buyers compare options.

A domain purchase is completed online with an immediate transfer of administrative rights. Rental allows customers to use the domain by assigning their own DNS servers; agreements include priority rights to buy the domain during the rental period, with the purchase price fixed in the contract. Rental agreements can run for up to 50 months. Customers can contact the marketplace through its help section or online chat to ask questions or propose a price. SITE.su also provides articles and reviews about domain names, including guidance on choosing between renting and buying.