SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service enables customers to browse, search, and compare available names, including keyword domains and transliterations, using an expanded search and downloadable listings.

Customers can purchase a domain online, with administration rights transferred immediately, or rent it 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 agreement. Rentals are priced monthly, and agreements can run for up to 50 months.

The marketplace provides domain details such as registration age, price, and indicators based on search statistics and search-engine data to help customers assess potential SEO appeal. Users can submit questions or price offers for individual domains, and the site provides assistance through its Help section and online chat. SITE.su serves individuals and businesses seeking a memorable web address for an online project, with options to rent before committing to a purchase.