SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 listings across the .ru, .su, and .рф domains. The service enables customers to buy a domain through an online transaction with immediate transfer of administrative rights, or rent one by assigning their own DNS servers. Rental agreements include priority rights to purchase the domain during the rental period, with the buyout price fixed in the contract; agreements can last up to 50 months.

Customers can browse the full domain catalogue, download a spreadsheet of listings, or use advanced search to find names by keyword and other criteria. Listings include purchase and monthly rental prices, domain age, and indicators of search and SEO appeal. For selected names, shoppers can submit a question or offer a price, with email and phone details required. The site also provides a help section and online chat for enquiries. SITE.su presents its catalogue as a practical resource for businesses and personal projects seeking memorable web addresses, including names suited to particular topics or markets.