SITE.su is an online marketplace specializing in premium domain names, offering a catalog of more than 40,000 domains, primarily in the .ru, .su, and .рф zones. Customers can purchase a domain with online processing and immediate transfer of administration rights, or rent one by assigning their own DNS servers. Rental agreements include a priority right to buy the domain, with the purchase price fixed in the contract; agreements can run for up to 50 months.

The marketplace provides tools to search domains by keyword or other parameters, view a full inventory, and download domain listings with metrics. Listings may include rental and purchase prices, domain age, and indicators related to search interest and SEO appeal. Customers can submit questions or price proposals, and the site offers help, contacts, and online chat. The service is intended for businesses and individuals seeking a memorable web address for an online project, with both immediate acquisition and a lower-commitment rental option.