SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service helps individuals and businesses find keyword-focused domain names for websites and online projects, with search tools for matching terms, transliterations, synonyms, and other parameters. Visitors can browse the full domain list or download it as an Excel file.

SITE.su offers both immediate domain purchases and monthly rentals. 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 rental period, with the purchase price fixed in the agreement; contracts can last up to 50 months. The site provides online checkout, account registration, customer support, and a contact form for questions or price offers. Listings may include domain age and search-related indicators to help customers compare options. SITE.su focuses on making domain selection, purchase, and rental accessible through a searchable online storefront.