SITE.su is an online marketplace for domain names, offering more than 40,000 domains across the .ru, .su, and .рф zones. The service helps businesses and individuals find web addresses suited to their projects, with search tools for keywords, transliterations, translations, synonyms, and other criteria. Visitors can browse the full domain catalogue, download a list with available metrics, and review information such as domain age and search-related ratings.

Domains can be acquired through an online purchase or rented by the month. Purchases include the transfer of domain administration rights, while rental allows customers to set their own DNS servers. Rental agreements provide a priority right to buy the domain during the contract, with the purchase price fixed in advance; agreements can last up to 50 months. Customers can use the shopping cart for immediate transactions or contact the marketplace to ask questions and propose a price. SITE.su also provides help, contact information, and online chat for customers considering a domain.