SITE.su is an online marketplace specializing in premium domain names and keyword-focused web addresses. Its catalog includes around 40,000 domains in the .ru, .su, and .рф zones, serving businesses, organizations, and individuals looking for a suitable name for a website or project. Customers can purchase domains online, with administration rights transferred immediately, or rent a domain by assigning their own DNS servers. Rental agreements include a priority right to buy the domain during the agreement, with the purchase price fixed in the contract; rental terms can last up to 50 months.

The marketplace provides tools to browse available names, search by keywords or other parameters, and view a full domain list. Customers can also download a spreadsheet containing domain information and submit questions or price offers through the site. A help section provides access to contacts and online chat. SITE.su presents domain details such as price, age, and search-related indicators, helping visitors compare options before choosing a domain to buy or rent.