SITE.su is an online marketplace specializing in premium domain names, with a catalog of more than 40,000 domains in the .ru, .su, and .рф zones. The service helps individuals and businesses find keyword-based web addresses, including names related to particular topics, and offers tools for searching by terms or other parameters.

Customers can purchase a domain online, with administration rights transferred after the transaction, or rent one by assigning their own name servers. Rental is priced by the calendar month and includes a contractual priority right to buy the domain during the rental period, at a purchase price set in the agreement. Rental agreements can run for up to 50 months.

SITE.su provides domain listings with purchase and rental prices, alongside available information such as domain age and search-related indicators. Visitors can view or download the full catalog, including an Excel list, and contact the marketplace through its help section or online chat. For listed domains, customers can also submit a question or propose their own price.