SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains available across the .ru, .su, and .рф zones. The service helps businesses and individuals find keyword-focused domain names, including names related to particular industries and search terms. Customers can browse listings, search by keywords or other parameters, view domain information, and download a complete catalog.

Domains are available for immediate purchase or monthly rental. A purchase transfers the rights to administer the domain, while rental lets the customer use their own DNS servers and includes a priority right to buy the domain during the agreement. The purchase price can be fixed in the rental contract, which may run for up to 50 months. Listings display prices and may include domain age and indicators of search-related appeal. Customers can submit a question or offer a price, and the site provides a help section with contact details and online chat.