SITE.su is an online marketplace for premium domain names, offering a catalog of approximately 40,000 domains, primarily in the .ru, .su, and .рф zones. Customers can browse domains, search by keywords or other parameters, view a full catalog, or download a list for further review. The marketplace supports both immediate purchases and rentals, with listings displaying prices and, where available, information such as domain age and search-related indicators.

A purchase transfers domain administration rights, while a rental allows the customer to assign their own DNS servers. Rental agreements include a priority right to buy the domain during the agreement and set the purchase price in advance; contracts can run for up to 50 months. Transactions can be initiated online, and customers may contact the seller to ask questions or propose a price. The site also provides account access, help, contact information, and online chat. SITE.su positions its inventory as a resource for businesses and web projects seeking keyword-oriented domain names, with options to compare, rent, or acquire a suitable address.