SITE.su is an online marketplace for premium domain names, offering a catalogue of more than 39,000 to 40,000 domains, primarily in the .ru, .su, and .рф zones. Customers can browse listings, search by keywords or other parameters, and view related domains, including names containing synonyms or transliterations. The site provides tools to display or download the full domain list, with some listing data covering age and search-related indicators.

Domains can be purchased online, with ownership administration transferred upon purchase, or rented for a monthly fee. Rental gives customers the right to change the domain’s name servers and includes a contractual priority right to buy the domain during the rental period; the purchase price is fixed in the agreement, which can last up to 50 months. Listings show purchase and rental prices, and customers can contact the marketplace to ask questions or propose a price. SITE.su also offers help and online chat, along with account registration and sign-in.