SITE.su operates an online marketplace for premium domain names, offering a catalog of more than 40,000 domains, primarily in the .ru, .su, and .рф extensions. Customers can browse and search names by keyword or other parameters, view domain details, and download the full catalog as an Excel file. The marketplace supports both immediate online purchases, with instant domain transfer, and monthly rentals, which are arranged by assigning the customer’s DNS servers. Some rental offers include a guaranteed right to buy the domain later.

Listings display purchase and rental prices, and may include information such as domain age, ratings, and search statistics. Customers can submit questions or propose a price for an individual domain through the site, with assistance available in its help section and online chat. The catalog includes names matching search terms, translated or transliterated keywords, and domains beginning with specified letters. SITE.su presents its service as a way for individuals and businesses to find and secure domain names for websites, brands, or online projects.