SITE.su is an online marketplace specializing in premium domain names, offering around 40,000 domains across the .ru, .su, and .рф zones. Customers can browse and search available names, view listings with prices and selected age and search-related indicators, and download the full catalogue as an Excel file. The marketplace supports both immediate online purchases and domain rentals, with prices shown in rubles.

A purchase transfers domain administration rights, while renting allows the customer to use the domain by assigning 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 may last up to 50 months. The site also offers expanded search options and lets prospective customers ask questions or submit a price offer through an online form. Help, contact information, and online chat are available through its support section. SITE.su presents its service as a convenient way for businesses and individuals to find, acquire, or rent domain names for websites and online projects.