SITE.su is an online marketplace specializing in premium domain names, with a catalog of around 40,000 domains across the .ru, .su, and .рф zones. Customers can browse listings, search by keyword or other criteria, and view information such as domain age and search-related indicators. The marketplace offers both immediate purchases and monthly rentals, with prices and availability displayed for individual domains.

Buying a domain transfers its administration rights to the buyer. Renting allows the customer to assign their own DNS servers, and the rental agreement includes a priority right to purchase the domain at a price fixed in the contract. Rental agreements can run for up to 50 months. Buyers and prospective renters can submit questions or offers through the site, and support is available through its Help section and online chat. SITE.su also provides options to view or download the full domain catalog, including a spreadsheet export. Its services are designed for businesses and individuals seeking a domain for an online project, brand, or website.