SITE.su is an online marketplace for domain names, offering a catalog of more than 40,000 domains across the .ru, .su, and .рф zones. Customers can browse available names, search by keywords or other parameters, and review listings with details such as price, domain age, and search-related indicators. The catalog can also be viewed or downloaded as a spreadsheet.

The marketplace provides both online domain purchases and rentals. A purchase transfers the rights to administer the domain, while a rental allows the customer to change its DNS server addresses. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the agreement; rental terms can last up to 50 months. SITE.su presents purchase and rental prices for individual listings and offers a contact form for questions or price proposals. Help and online chat are available through its support section, and account access is provided for customers who wish to register or sign in.