SITE.su is an online marketplace specializing in premium domain names, offering more than 40,000 domains for customers to browse. Its listings include keyword-focused names in the .ru, .su, and .рф zones, with search tools to find domains by words or other criteria. Customers can review a full domain list online or download it as an Excel file, including available performance data such as age and search-related indicators.

The marketplace supports both immediate online purchases and rentals. Buying a domain transfers its administration rights, while renting allows the customer to set their own DNS servers. Rental agreements include a priority right to purchase the domain at a price fixed in the contract; agreements can run for up to 50 months. Listings show purchase prices and monthly rental rates, and customers can submit questions or make an offer through the site. SITE.su also provides registration and sign-in options, along with help, contact information, and online chat. Its services are designed for people seeking a domain for a business, website, or personal project.