SITE.su is an online marketplace specializing in premium domain names, including keyword domains and websites in the .ru, .su, and .рф zones. Its catalog offers tens of thousands of names, with options to buy or rent a domain for a business or personal project. Customers can browse listings, search by words or topics, and use advanced filters to find relevant names. The site also provides downloadable domain lists in Excel format, with listing details such as purchase and rental prices and, where available, age and rating information.

Purchases can be completed online, with the domain transferred immediately. For rentals, customers assign their own DNS servers, and selected rental arrangements include a guaranteed right to buy the domain later. Listings show separate purchase and monthly rental prices, while some names may be available at a negotiable price. Visitors can submit questions or offers through the site, with contact and online chat available in the Help section.