SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains in the .ru, .su and .рф zones. The service enables individuals and businesses to find names suited to their projects, review available options and choose between purchasing and renting a domain.

Purchases are completed online, with domain administration rights transferred to the buyer. For rentals, customers can assign their own DNS servers and use the domain for an agreed period. Rental agreements include a priority right to purchase the domain, with the buyout price set in the contract; the stated maximum agreement term is 50 months. The marketplace provides domain search tools, including expanded search, and lets users view or download domain listings. Customers can also contact the service through its Help section or online chat, ask questions about a specific domain, or submit a price offer. SITE.su presents domain details such as purchase and monthly rental prices, age and search-related indicators to help users compare options.