SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains, with listings in the .ru, .su, and .рф extensions. Customers can browse domains by keyword and explore related names, including synonyms, translations, and transliterations. Search tools include filtering by criteria, viewing the full catalog, and downloading a domain list in Excel.

The marketplace supports both direct purchases and monthly rentals. Buyers can complete purchases online, with domains transferred immediately, while rentals are arranged by assigning the customer’s DNS servers. The site also offers rental agreements with a guaranteed right to buy, giving customers an option to acquire a domain later. Each listing displays pricing and may include details such as domain age and available rating or search statistics. Customers can place an order through the shopping cart, ask questions, or propose a price using the contact form. Help and online chat are available through the support section.