SITE.SU operates an online marketplace for premium domain names, offering more than 40,000 domains across the .ru, .su, and .рф extensions. The service helps businesses and individuals find web addresses suited to their projects, with listings that include keyword domains and related alternatives. Customers can purchase a domain online with immediate transfer or rent one by assigning their own DNS servers. Rental agreements include a guaranteed right to buy, providing a path from temporary use to ownership.

The marketplace provides search tools for finding domains by word or multiple topics, as well as an expanded search for browsing available options. Visitors can view a complete domain list online or download listings in Excel, including details such as age, rating, and selected search statistics. Each listing shows purchase and monthly rental prices, and customers can submit questions or propose a price through the site. A help section offers contact information and online chat, while account access supports registration and sign-in.