SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service helps businesses and individuals find keyword-rich names for websites, brands, and other online projects. Customers can purchase domains online with immediate transfer or rent them by assigning their own DNS servers. Rental options include a guaranteed right to buy, giving customers flexibility to start using a domain before deciding whether to acquire it.

The marketplace provides tools to browse the full catalog, search by words or themes, and refine results with advanced search. Visitors can also download domain lists, including information such as age and search or ranking indicators. Listings display purchase and monthly rental prices, and customers can ask questions or propose a price through the site. Support and online chat are available in the Help section, while account access enables users to register and sign in. SITE.su focuses on making domain selection, purchase, and rental straightforward and accessible.