SITE.su is an online marketplace specializing in premium domain names, with a selection of roughly 39,000 to 40,000 domains in the .ru, .su and .рф zones. The service enables customers to buy a domain online or rent it for monthly use, making domain names available to businesses and projects seeking an online identity. Purchases are handled online with immediate transfer of domain administration rights. For rentals, customers can assign their own DNS servers; rental agreements also provide a priority right to buy the domain, with the purchase price fixed in the contract. Agreements can run for up to 50 months.

Visitors can browse the full domain catalogue, download listings, or use advanced search to find names by keywords and other criteria. Domain listings may include details such as price, age and search-related indicators. Customers can submit questions or offers on individual domains, while the Help section provides contact information and online chat. SITE.su presents both outright purchase and rental as flexible ways to secure a suitable domain name.