SITE.su is an online marketplace for premium domain names, offering a catalog of around 40,000 domains, primarily in the .ru, .su, and .рф extensions. The service helps businesses, entrepreneurs, and other project owners find keyword-based domain names for websites and online ventures.

Customers can purchase domains online, with administration rights transferred immediately, or rent them by assigning their own DNS servers. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price set in the contract; agreements can last up to 50 months. The marketplace lists prices and, for many domains, details such as registration age and indicators of search interest and SEO appeal.

Users can search by keyword, explore related names, and use advanced search tools. SITE.su also provides options to view or download the full domain list, ask questions, and propose a price for a listing. Contacts and online chat are available through the Help section.