SITE.su is an online marketplace specializing in premium domain names, with a catalogue of approximately 40,000 domains, including keyword-rich options in the .ru, .su, and .рф zones. The service helps individuals and businesses find a domain for an online project through domain search, browsing the full catalogue, and filtering by search criteria. Listings include purchase and rental prices, and may show details such as domain age and indicators of search visibility.

Customers can buy a domain online, with administration rights transferred after purchase, or rent it by arranging for their own DNS servers to be assigned. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the contract. Rental is priced by calendar month, and agreements can run for up to 50 months. SITE.su also offers downloadable domain lists, information about individual listings, and support through its Help section, contacts, and online chat. Buyers can submit questions or propose a price for a domain.