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 helps individuals and businesses find keyword-based domain names for websites and online projects. Customers can browse the full catalogue, search by terms or parameters, review related and transliterated suggestions, and download domain listings for further consideration.

Domains are available for immediate purchase or monthly rental. A purchase transfers domain administration rights, while rental allows the customer to use the domain by setting its DNS servers. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the contract; agreements can last up to 50 months. The marketplace displays pricing and, for listed domains, information such as age and search-related indicators. Customers can submit questions or price offers and contact the service through its Help section, which also provides online chat.