SITE.su operates an online marketplace for premium domain names, offering more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service helps businesses and individuals find keyword-based and other memorable domain names for websites and online projects. Customers can search the catalogue by words or themes, use advanced search options, and review a full domain list available online or as an Excel download.

The marketplace supports both immediate purchases and monthly rentals. Purchased domains are transferred online, while rental customers can assign their own DNS servers; some rental arrangements include a guaranteed right to buy. Listings show prices and may include information such as domain age and search-related ratings. Customers can submit questions or price offers through the site, with contact details and online chat available in the Help section. Registration and sign-in are provided for users who want to manage transactions. SITE.su presents domain acquisition and rental as flexible options for establishing or expanding an online presence, with a broad selection of Russian-language and international-character domain names.