SITE.su is an online marketplace for premium domain names, offering a catalog of around 40,000 domains across the .ru, .su and .рф zones. Customers can browse listings, search by keyword or other criteria, view a complete domain list, or download catalog data for review. The marketplace supports both immediate purchase and monthly rental, with prices displayed in rubles.

Purchasing a domain transfers its administrative rights to the buyer. Rental allows customers to assign their own name servers and includes a priority right to purchase the domain during the rental period; the buyout price is specified in the agreement. Rental agreements can run for up to 50 months. Listings may include details such as domain age, price, a marketplace rating, and search-related metrics.

For a particular domain, visitors can use the online purchase or rental options, submit a question or offer a price, and contact the marketplace through its help section or online chat. The site also provides registration and sign-in features for customers.