SITE.su is an online marketplace specializing in premium domain names, offering a catalog of more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service is designed for businesses and individuals seeking a domain for a website or online project. Customers can browse the full catalog, search by keywords or other parameters, and download a domain list with SEO-related indicators.

Domains are available for immediate purchase or monthly rental. A purchase transfers domain administration rights, while rental lets customers assign their own DNS servers. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the contract; agreements can last up to 50 months. The site provides online ordering, account registration, a question form for inquiries or price offers, and help and online chat through its support section. Listings may include domain age, price, and ranking information based on search data.