SITE.su operates an online marketplace for premium domain names, offering more than 40,000 domains, primarily in the .ru, .su, and .рф extensions. The service helps individuals and businesses find memorable, keyword-focused web addresses for websites, brands, and online projects. Customers can purchase domains online with immediate transfer or rent them by assigning their own DNS servers. Rental options may include a guaranteed right to buy the domain later.

The marketplace provides domain search by words, phrases, and related terms, alongside an expanded search function. Visitors can browse the full inventory, download a domain list in Excel, and review available purchase and monthly rental prices. Listings may also show domain age and selected popularity or search metrics. For buyers who wish to negotiate, the site offers a way to ask questions or submit a price proposal; its help section includes contact details and online chat. SITE.su presents itself as a practical resource for choosing and securing domain names, with options for both immediate acquisition and flexible rental.