SITE.su is an online marketplace specializing in premium domain names, offering a catalog of more than 40,000 domains across the .ru, .su, and .рф zones. The service is designed for individuals and businesses looking for a web address for a brand, website, or project. Customers can purchase domains online with immediate transfer, or rent them by assigning their own DNS servers. Rental agreements include a guaranteed right to buy the domain, providing a route from temporary use to ownership.

The marketplace supports searches by keyword and offers an extended search, along with lists of matching, transliterated, translated, and related domain names. Visitors can view the full catalog online or download a spreadsheet of available domains. Listings provide purchase and monthly rental prices, and some include information such as domain age and search metrics. Buyers can add a domain to a cart for an immediate transaction or contact the seller to ask questions or propose a price. Help resources, contact details, and online chat are also available through the site.