SITE.su is an online marketplace for premium domain names, offering a catalog of approximately 39,000 to 40,000 domains in the .ru, .su and .рф zones. Customers can browse and search for keyword-based domain names, explore related spellings or translations, and review listed purchase and rental prices. Search tools include an expanded search, while the full domain catalog can be viewed online or downloaded as a spreadsheet.

The marketplace supports both immediate purchases and domain rentals. A purchase transfers the administration rights to the buyer, while renting allows the customer to use 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. SITE.su provides online checkout for available domains and offers a contact form, help section and online chat for questions or price proposals. Its listings may also display domain age and search-related indicators to help customers assess options.