SITE.su is an online marketplace specializing in premium domain names, offering a catalogue of more than 39,000 to 40,000 domains in the .ru, .su and .рф extensions. Customers can browse available names, search by keyword or other parameters, view related domain suggestions, and download the full catalogue as an Excel file. Listings provide details such as purchase and monthly rental prices, domain age, and search-related ratings.

The marketplace supports both immediate online purchases and domain rental. A purchase transfers the rights to administer the domain, while rental allows the customer to use their own name servers. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the contract. Agreements may run for up to 50 months. Customers can place orders through the site, submit questions or price offers, and contact the service through its help section and online chat. SITE.su presents its service as a way for businesses and individual projects to find and secure suitable domain names.