SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains, primarily in the .ru, .su, and .рф zones. Customers can browse available names, search by keywords or other parameters, and view domain details such as price, age, and selected search and SEO metrics. The site provides downloadable domain lists, including spreadsheet exports, and offers contact options for questions or price negotiations.

Domains can be purchased online, with the marketplace describing purchase as a transfer of administrative rights. Customers may also rent a domain by arranging for their own name servers to be used. Rental is priced per calendar month and includes a priority right to buy the domain during the rental term, with the purchase price fixed in the agreement. Rental agreements can run for up to 50 months. The site supports online account access, domain-specific inquiries, and offers covering individual names, including framuga.ru and related Cyrillic or transliterated domains. SITE.su focuses on helping customers secure domain names for websites and online projects.