SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains in the .ru, .su, and .рф zones. The service helps businesses and individuals find keyword-based domain names and provides options to purchase or rent them. Buyers can complete purchases online, with domain administration rights transferred immediately. For rentals, customers can assign their own DNS servers, and the agreement includes a priority right to buy the domain during the rental period at a price fixed in the contract. Rental prices are listed per calendar month, and agreements can run for up to 50 months.

Visitors can search the catalog by words or other parameters, view domain details, and download the full listing as an Excel file. The marketplace also displays information such as domain age and indicators related to search interest and SEO attractiveness. Customers can contact the service through its help section or online chat, ask questions about a specific domain, or submit a price offer.