SITE.su is an online marketplace for premium domain names, offering a catalog of approximately 40,000 domains, primarily in the .ru, .su, and .рф zones. Customers can browse available names, search by keywords or other parameters, and view listings with details such as purchase and rental prices, domain age, and search-related indicators.

The marketplace supports both immediate purchases and monthly rentals. A purchase transfers domain administration rights, while renting allows the customer to assign their own DNS servers. Rental agreements include a priority right to buy the domain at a price fixed in the contract, with agreements available for up to 50 months. This gives businesses and individual project owners a way to use a domain before deciding whether to acquire it permanently.

SITE.su also provides tools to view or download the full domain list, including spreadsheet exports, and offers help, contact options, and an online chat. Customers can submit questions about a specific domain or propose a price.