SITE.su operates an online marketplace for premium domain names, offering more than 40,000 domains, primarily in the .ru, .su, and .рф zones. Customers can browse available names, search by keywords or other parameters, view domain statistics, and download the full inventory as an Excel file. The marketplace provides both direct purchase and rental, with options and pricing displayed for individual domains.

Purchases are completed online, with domain administration rights transferred immediately. For rentals, customers can use their own DNS servers; rental agreements run by the calendar month and include a priority right to buy the domain at a price fixed in the contract. The maximum rental term is 50 months. Site.su also invites buyers to ask questions or propose a price through its contact form, and provides registration, login, help, and online chat support. Its listings include domain age and search-related indicators, helping visitors compare names. The service is designed for individuals and businesses seeking a web address for an online project, with both short-term access and ownership available.