SITE.su is an online marketplace specializing in premium domain names, with a catalog of approximately 39,000 to 40,000 domains. Its listings include keyword and website domains in the .ru, .su, and .рф zones, offering options for businesses, website owners, and other online projects.

Customers can purchase domains online with immediate transfer or rent them by assigning their own DNS servers. The rental service also offers an option with a guaranteed right to buy, giving customers a way to use a domain before deciding to acquire it. Listings display purchase and monthly rental prices, with additional details such as domain age and available rating and search statistics.

The marketplace provides several tools for exploring its inventory, including an expanded search by parameters, a full domain list, and a downloadable spreadsheet. Visitors can search by words or topics, review related and translated domain suggestions, and submit a question or price offer for a specific name. Help, contact information, and online chat are available through the site.