SITE.su is an online marketplace specializing in premium domain names, offering more than 40,000 domains, primarily in the .ru, .su and .рф zones. The service enables customers to purchase a domain through an online transaction with immediate transfer of administrative rights, or rent one by assigning their own DNS servers. Rental agreements include priority rights to buy the domain during the rental period, with the purchase price set in the contract; agreements may run for up to 50 months.

The marketplace features keyword-based domains and transliterated alternatives, with listings that include purchase and monthly rental prices. Customers can browse or download the complete domain list, use advanced search, and review available information such as domain age and search-related ratings. The site also provides a question-and-offer form for negotiating a price, along with a help section and online chat. SITE.su presents domain names for businesses and projects seeking a distinctive web address, with options suited to different budgets and the choice of ownership or rental.