SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains listed across the .ru, .su, and .рф zones. The service gives businesses and individuals the option to buy a domain outright or rent it, making it possible to choose between immediate ownership and a monthly arrangement. Purchases are completed online with an immediate transfer of domain administration rights. For rentals, customers assign their own DNS servers; rental agreements include a priority right to buy the domain, with the purchase price fixed in the contract. Agreements can run for up to 50 months.

Visitors can browse the full domain catalogue, download a list in Excel, or use advanced search to find names by keyword or other parameters. Listings show purchase and rental prices and may include details such as domain age and search-related indicators. Customers can submit questions or offers on individual names, and the site provides help, contacts, and online chat.