SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains, primarily in the .ru, .su and .рф zones. Customers can browse listings, search by keywords or other parameters, view domain details, and download the full catalogue as an Excel file. The marketplace supports both immediate purchase and rental, with listed prices and information such as domain age and search-related indicators.

A purchase transfers the rights to administer the domain, while rental allows the customer to assign their own DNS servers for a monthly fee. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price set in the contract; agreements can last up to 50 months. The site also provides a contact form for questions or price offers, along with help and online chat. Its services are designed for individuals and businesses seeking a domain name for an online project, whether they want to acquire it outright or use it through a rental arrangement.