SITE.su is an online marketplace specializing in premium domain names, offering a catalog of more than 40,000 domains, including names in the .ru, .su, and .рф zones. Customers can browse listings, search by keyword or other parameters, view the full domain catalog, and download a list for review. The service supports both immediate online purchase and monthly rental, with the available option and price shown for each listing.

Purchasing a domain transfers its administrative rights to the buyer. Rental allows the customer to assign their own DNS servers and includes a priority right to purchase the domain during the rental agreement. The purchase price is fixed in that agreement, which can last up to 50 months. SITE.su also invites inquiries and offers from prospective buyers, with contact details and online chat available through its help section. Its listings include information such as domain age and search-related indicators, helping customers assess names for potential business use and online presence.