Site.su is an online marketplace for premium domain names, offering buyers and businesses a selection of more than 39,000 domains in the .ru, .su, and .рф zones. Customers can purchase a domain through an online process with immediate transfer of administrative rights, or rent one 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; agreements can run for up to 50 months.

The marketplace provides tools to browse or search its listings, including an expanded search, a complete domain list, and an Excel download with domain information. Listings may include purchase and monthly rental prices, domain age, and indicators of search-related appeal. Customers can contact the seller about a domain or submit a price offer through the site, and assistance is available through its Help section and online chat. Site.su serves individuals and organizations looking for domain names for websites and online projects.