SITE.su is an online marketplace specializing in premium domain names. It offers more than 40,000 domains, primarily in the .ru, .su, and .рф zones, with options to buy or rent names through the website. Buyers can purchase a domain online with immediate transfer of administration rights, while rental allows customers to use the domain by assigning their own DNS servers. Rental agreements include a priority right to purchase the domain during the rental term, with the buyout price set in the contract; agreements can last up to 50 months.

The marketplace provides tools to browse or search its inventory, including an expanded search, a complete domain list, and downloadable listings with SEO-related indicators. Domain pages display purchase and monthly rental prices, registration age, and a rating based on search and keyword data. Customers can contact the service through its help section or online chat, ask questions about a domain, or propose a price.