SITE.su is an online marketplace for premium domain names, offering a catalogue of around 40,000 domains in the .ru, .su, and .рф extensions. Customers can browse available names, search by keywords or other criteria, view a full domain list, or download catalogue data in Excel. The marketplace supports both immediate purchase and monthly rental, with prices and available domain information displayed in its listings.

Purchasing a domain involves transferring its administrative rights, while renting allows the customer to assign their own DNS servers. Rental agreements include a priority right to buy the domain during the agreement period, with the purchase price fixed in the contract. The stated maximum rental term is 50 months. Customers can submit questions or price offers through the site, and the help section provides access to contacts and online chat. SITE.su presents domain details such as age, price, and search-related indicators to help visitors assess options for their online projects.