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

The marketplace offers tools to search by words or themes, use advanced search parameters, view the full domain list, and download listings as an Excel file. Domain information may include age and indicators of search and SEO potential. Customers can contact the service through its help section or online chat, ask questions about a domain, or propose a price.