SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains across the .ru, .su, and .рф zones. The service helps businesses and individuals find names for websites and projects, with search tools for matching terms, prefixes, and other criteria. Visitors can browse the full domain inventory, download a spreadsheet of listings, or contact the team through the Help section and online chat.

Domains are available for immediate purchase or 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 contract and set the purchase price in advance; agreements may run for up to 50 months. The site displays listing prices and information such as domain age and search-related indicators. Customers can also submit a question or offer a price for a domain. SITE.su provides an online route to compare options and secure a domain for a business or personal project.