SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains offered for buyers and renters. Its inventory focuses on keyword-rich names in the .ru, .su and .рф domains, and listings include purchase and monthly rental prices. Customers can complete eligible purchases online, with domain administration transferred immediately, or rent a name 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; the stated maximum agreement term is 50 months.

The marketplace provides tools to browse the full domain list, download inventory data, and search by keywords or other parameters. Listings may also show domain age and indicators related to search visibility. Customers who want to negotiate or ask about a particular name can contact the seller through a question form, while help and online chat are available in the support section.