SITE.su is an online marketplace specializing in premium domain names, with a catalogue of more than 40,000 domains across the .ru, .su, and .рф extensions. The store serves businesses and individuals looking for domain names for websites, brands, or personal projects. Customers can browse available listings, search by keywords or other parameters, view a full domain list, or download catalogue data in Excel format.

SITE.su offers two ways to obtain a domain: immediate online purchase and monthly rental. A purchase transfers the rights to administer the domain, while rental allows the customer to assign their own DNS servers. Rental agreements include a priority right to buy the domain during the agreement, with the purchase price fixed in the contract; the maximum rental term is 50 months. Listings provide prices and may include details such as domain age and SEO-related indicators. Customers can contact the store with questions or offers, and assistance is available through its help section and online chat.