SITE.su is an online marketplace specializing in premium domain names for businesses, websites, and personal projects. Its catalogue includes more than 39,000 domains, primarily in the .ru, .su, and .рф zones, including keyword-based names and options in Latin and Cyrillic scripts. Customers can purchase a domain online with immediate transfer of administration rights or rent it by assigning their own DNS servers. Rental agreements include a priority right to buy the domain at a price fixed in the contract, and can last up to 50 months.

The marketplace provides search tools for finding domains by words and other parameters, as well as downloadable catalogue lists. Listings show purchase and monthly rental prices, alongside details such as domain age and indicators of search-related potential. Customers can submit questions or offers on individual names, and the site provides assistance and online chat through its Help section. SITE.su brings domain discovery, comparison, negotiation, and acquisition together in one service.