SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains offered for sale or rent. Its listings focus on keyword domains in the .ru, .su and .рф extensions, and the site provides tools to browse the full inventory, search by terms or criteria, and download a domain list in Excel format.

Customers can purchase a domain online, with ownership administration transferred immediately, or rent one by assigning their own DNS servers. Rental is priced by the calendar month and includes a contractual priority right to buy the domain during the rental period; the purchase price is fixed in the agreement, which can run for up to 50 months. The marketplace displays information such as prices, domain age and search-related indicators to help visitors compare listings. Prospective buyers and renters can submit questions or offers, while the Help section provides contact details and online chat. SITE.su serves individuals and businesses seeking a distinctive web address for an online project.