SITE.su is an online marketplace for premium domain names, offering a catalogue of more than 39,000 domains, primarily in the .ru, .su, and .рф zones. The service helps businesses, website owners, and project creators find and secure domain names through either direct purchase or rental.

Purchases can be completed online, with domain administration rights transferred to the buyer. Rental is charged monthly and allows the customer to assign their own name servers. Rental agreements include a priority right to buy the domain during the contract, with the purchase price set in advance; agreements can run for up to 50 months.

Visitors can search by keywords and related terms, use advanced search options, browse or download the full domain list, and compare information such as domain age and search-related indicators. The marketplace also provides a contact form and online chat through its help section, where customers can ask questions or propose a price. SITE.su presents domain acquisition and rental as flexible options for establishing an online presence.