SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains available across the .ru, .su, and .рф zones. The service enables customers to purchase a domain online with immediate transfer of administration rights or rent one by assigning 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.

Customers can browse the full domain inventory, download a spreadsheet, or use advanced search to find names by keyword and other criteria. Listings show purchase and monthly rental prices, along with information such as domain age and search-related ratings. For domains that interest them, users can submit questions or propose a price, and the site offers help and online chat through its support section. Registration and sign-in are available for customers who want to use the marketplace.