SITE.su is an online marketplace for buying and renting domain names, with a catalog of approximately 39,000 to 40,000 domains in the .ru, .su, and .рф zones. The service helps businesses, entrepreneurs, and individuals find web addresses suited to a brand, project, or chosen keywords. Visitors can search by one or more terms, use advanced search options, browse the full domain list, or download the catalog as an Excel file.

SITE.su offers two ways to obtain a domain. Purchases are completed online, with domain administration rights transferred immediately. Rentals are charged monthly and allow the renter to assign their own DNS servers. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the contract; agreements can last up to 50 months. The marketplace displays domain details and pricing, and customers can submit questions or price offers through its contact form. Help resources and an online chat are available for assistance.