SITE.su is an online marketplace specializing in premium domain names. The site lists tens of thousands of domains, including keyword-based names in the .ru, .su, and .рф zones, and enables customers to purchase or rent them. Its catalog includes domains that match search terms, translations, and related words, with listings displaying prices and, where available, age and rating information.

Customers can buy domains online with immediate transfer or rent them by assigning their own DNS servers. Some rental arrangements include a guaranteed right to purchase the domain later. The marketplace supports instant transactions through shopping-cart options, alongside a contact form for questions and price offers. Visitors can browse the full domain list, download listings as a spreadsheet, and use advanced search to find names by specific criteria. Help resources, account registration, sign-in, and online chat are also available. SITE.su presents its service as a convenient way to find and secure domain names for business or personal projects, with options to suit different budgets and plans.