SITE.su is an online marketplace for buying and renting domain names, with a catalog of approximately 40,000 domains across the .ru, .su, and .рф zones. The service helps individuals and businesses find keyword-based domain names and complete transactions online. Buyers can purchase a domain with an immediate transfer of administration rights, while renters can use a domain by assigning 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 contract; the stated maximum agreement term is 50 months.

Visitors can search the catalog by words or themes, use advanced search filters, view domain details, and download the full listings as an Excel file. The marketplace supports instant purchase and rental through its shopping cart, and users can contact the seller to ask questions or propose a price. Contact options and online chat are available in the Help section. SITE.su presents domain information such as price, age, and SEO-related indicators to help customers compare available names.