SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains in the .ru, .su, and .рф zones. Customers can browse and search for keyword-based domain names, use advanced search options, and view related suggestions. The site provides tools to display or download the full domain list, including a spreadsheet export with domain metrics.

Domains are available for immediate purchase or monthly rental. A purchase transfers domain administration rights, while a rental lets the customer assign their own DNS servers. Rental agreements include a priority right to buy the domain during the contract term, with the purchase price fixed in the agreement; the stated maximum rental term is 50 months. Customers can also contact the marketplace to ask questions or propose a price. Domain listings may include age and indicators based on search data and search-engine indexes. SITE.su presents its service as a way for individuals and businesses to find and secure domain names for websites and online projects.