SITE.su is an online marketplace for premium domain names, offering more than 39,000 domains across the .ru, .su, and .рф zones. Customers can browse keyword-based domain names, search by terms or other criteria, and review listings that include purchase and rental prices, along with details such as domain age and search-related figures. The catalogue features Latin-script and Cyrillic names, including transliterations and domains associated with particular words or topics.

The marketplace supports immediate online purchases, with domains transferred upon purchase, as well as monthly rentals arranged by assigning the customer’s DNS servers. Some rental options include a guaranteed right to buy the domain later. Customers can purchase or rent directly through listing controls, download the full domain catalogue as an Excel file, or use the expanded search to find suitable names. The site also invites visitors to ask questions or propose a price for a domain, with assistance and online chat available through its Help section.