SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service enables customers to browse available names, search by keyword or other parameters, and review listings with purchase and rental prices, along with age and selected traffic or search indicators. Users can view or download the full domain catalogue, including a spreadsheet option, and contact the marketplace through its help section or online chat.

Customers can purchase a domain online with immediate transfer or rent one by assigning their own DNS servers. Rental listings include an option with a guaranteed right to buy, and prospective buyers can ask questions or propose a price. The site presents domain suggestions related to a search term, including transliterations and synonyms, helping visitors compare alternatives. SITE.su is designed for businesses and individuals seeking a web address for a project, website, or online presence, with convenient browsing and both short-term rental and outright purchase options.