SITE.su is an online marketplace specializing in premium domain names, with a catalog of more than 40,000 domains in the .ru, .su, and .рф zones. The service helps businesses and individuals find domain names for websites, online ventures, and personal projects, including keyword-based options and related names. Customers can browse the full catalog, use advanced search tools, or download a domain list with available metrics.

Domains are offered for immediate purchase or monthly rental. A purchase transfers the rights to administer the domain, while rental allows the customer to change its name server settings. Rental agreements include priority rights to buy the domain during the rental period, with the purchase price fixed in the contract; agreements can run for up to 50 months. The site displays pricing and information such as domain age and indicators of search-related appeal. Visitors can submit questions or price offers for individual domains, and the Help section provides access to contact options and online chat.