SITE.su is an online marketplace for premium domain names, offering a selection of approximately 40,000 domains, including keyword domains in the .ru, .su, and .рф zones. The service helps individuals and businesses find memorable web addresses for websites and online ventures. Customers can purchase a domain through an online transaction, with administration rights transferred immediately, or rent it by assigning their own DNS servers. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the contract. Rentals are priced by calendar month, and agreements can run for up to 50 months.

The marketplace provides domain search tools, including searches by keywords, synonyms, and other parameters. Visitors can view or download the full domain list, with some listings displaying age and search-related indicators. For a listed domain, customers can submit a question or price offer, while the Help section provides contact details and online chat.