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 available names, search by keywords or other parameters, and view a full catalogue or download a domain list. The marketplace supports both immediate online purchases, with instant domain transfer, and rentals, arranged by assigning the customer’s DNS servers. Rental agreements may include a guaranteed right to buy the domain later.

Listings display purchase and monthly rental prices, and some include details such as domain age, ratings, and search statistics. Customers can add a domain to the cart for purchase or rental, sign in to manage transactions, or contact the seller to ask questions and propose a price. The site also offers help, contact information, and online chat. Its catalogue includes Russian-language and transliterated names across a range of subjects, making the service useful to individuals and organizations seeking a domain for a website, project, or business.