SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 listings across the .ru, .su, and .рф zones. The service enables individuals and businesses to purchase a domain or rent one by assigning their own DNS servers. Online purchases include an immediate transfer of domain administration rights, while rental agreements provide a stated monthly price and a priority right to buy the domain during the rental term, with the purchase price fixed in the contract. Rental agreements can last up to 50 months.

Customers can browse the full domain catalogue, download listings with available metrics, and search by keywords or other parameters. The marketplace displays information such as domain age, price, and indicators intended to show search and SEO appeal. For selected domains, buyers can submit questions or make an offer through the site. SITE.su also provides registration and sign-in options, help information, and online chat.