SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains offered for sale or rent. Its listings focus on keyword-rich names in the .ru, .su, and .рф zones, giving businesses and individuals a range of options for websites, online projects, and brand ideas. Customers can purchase domains online with immediate transfer or rent them by assigning their own DNS servers. Some rental arrangements include a guaranteed right to buy the domain later, and visitors can contact the store to ask questions or propose a price.

The marketplace provides tools to browse its domain inventory, search by one or more terms, and refine results using an extended search. Users can view a complete domain list or download the listings as an Excel file, with information such as prices and available domain metrics. Shopping cart options support both purchases and rentals, while account access, help resources, contact details, and online chat are available through the site.