SITE.su is an online marketplace specializing in premium domain names, with a catalog of approximately 39,000 to 40,000 domains available in the .ru, .su, and .рф zones. The service helps individuals and businesses find a domain for a website, brand, or online project, offering keyword-based names and options in both Latin and Cyrillic scripts.

Customers can purchase domains online with immediate transfer or rent them by assigning their own DNS servers. Rental arrangements can include a guaranteed right to buy the domain later. The marketplace provides search tools for finding names by keyword or other parameters, alongside options to view or download the full domain list, including information such as age and ratings. Visitors can also submit a question or offer a price for a specific domain, with contact details and online chat available through the help section. SITE.su presents purchase and rental prices in rubles and supports account registration and login for customers managing transactions.