SITE.su operates an online marketplace for premium domain names, offering a selection of more than 40,000 domains, primarily in the .ru, .su and .рф zones. Customers can browse and search names by keyword, related terms or other parameters, view listing details, and download the complete catalogue as an Excel file. The marketplace supports both immediate online purchases, with instant domain transfer, and monthly rentals, arranged by assigning the customer’s DNS servers. Rental agreements can include a guaranteed right to buy the domain later.

Listings show prices for purchase and rental, alongside available information such as domain age, rating and search statistics. Customers can add a domain to a cart for purchase or rental, sign in to manage transactions, and contact the seller through an online chat or a question form to discuss a listing or propose a price. The site also provides a Help section and contact information. SITE.su focuses on making domain discovery and acquisition accessible for businesses and personal projects seeking a suitable web address.