SITE.su is an online marketplace for premium domain names, offering a selection of more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service helps individuals and businesses find keyword-based domains, with search tools for exact matches, translations, transliterations, and related terms. Customers can browse or download the full domain list, use filters, and review information such as domain age and search-related ratings.

Domains are available for immediate purchase or monthly rental. A purchase transfers the rights to administer the domain, while a rental lets the customer set its DNS servers. Rental agreements include a priority right to buy the domain at a price fixed in the contract, and may run for up to 50 months. The site also provides an inquiry form for questions or price offers, along with assistance and online chat through its Help section. SITE.su presents domain listings with prices in rubles and supports online transactions, including immediate purchase and rental requests.