SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains offered across the .ru, .su and .рф zones. The service allows customers to purchase a domain online or rent it for a monthly fee, making it possible to secure a web address without immediately buying it outright. Purchases involve an online transfer of domain administration rights, while rentals let customers assign their own DNS servers. Rental agreements include a priority right to buy the domain, with the purchase price fixed in the agreement; contracts can run for up to 50 months.

Customers can browse the full domain catalogue, search by words or other criteria, and download a list of available names with performance indicators. Listings show details such as purchase and rental prices, domain age and a rating based on search-related data. The marketplace also provides a help section, online chat and a contact form for questions or price offers.