SITE.su operates an online marketplace for premium domain names, offering a selection of more than 40,000 domains, primarily in the .ru, .su, and .рф extensions. The service helps businesses and individuals find web addresses for brands, websites, and personal projects, with search tools for exploring domains by keywords, related terms, and other criteria. Listings include pricing and, for many domains, age and search-related indicators.

Customers can purchase domains online with immediate transfer or rent them by assigning their own DNS servers. Rental arrangements include a guaranteed right to buy, and the site also supports price inquiries and negotiation through its contact form. Visitors can browse the full inventory, download a domain list in Excel, and use an expanded search to narrow results. The marketplace provides online chat and assistance through its help section, as well as account registration and sign-in. By combining domain discovery, purchasing, rental, and buyer support, SITE.su offers a practical way to secure a memorable web address.