SITE.su is an online marketplace specializing in premium domain names, particularly keyword domains and websites in the .ru, .su, and .рф extensions. The store lists more than 40,000 domains and serves customers looking for an address for a business, brand, or personal project. Visitors can browse the full inventory, search by words or other criteria, and download a domain list with metrics in Excel.

The marketplace offers both online purchases and domain rentals. Purchases are described as including immediate domain transfer, while rentals are arranged by assigning the customer’s DNS servers; some rental options include a guaranteed right to buy. Listings display prices and, where available, information such as domain age and search or rating metrics. Customers can submit questions or propose a price for a domain, with email and phone details required for inquiries. Help, contact information, and online chat are available through the site’s Help section, and users can register or sign in to manage their activity.