SITE.su is an online marketplace for premium domain names, offering a catalog of approximately 40,000 domains, including keyword-based names in the .ru, .su, and .рф zones. The service is designed for businesses and individuals seeking a domain for a website, online project, or brand. Customers can browse listings, search by one or more terms, use advanced search options, and view or download the full domain list, including data such as age and selected rating indicators.

Domains are available for immediate purchase or monthly rental. A purchase transfers domain administration rights online, while rental allows the customer to assign their own DNS servers. Rental agreements include a priority right to buy the domain during the agreement and specify a fixed purchase price; the stated maximum agreement term is 50 months. Prospective customers can ask questions or propose a price through the site, and assistance is available in its Help section, which includes contacts and online chat. SITE.su presents domain listings with purchase and rental prices to help customers compare options.