SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains across the .ru, .su, and .рф zones. The service is designed for businesses, entrepreneurs, and individuals seeking a memorable web address for a project or brand. Customers can browse the full catalog, search by keywords or other parameters, and review domain details such as age and search-related indicators.

Domains are available for immediate online purchase or monthly rental. A purchase transfers domain administration rights, while rental lets customers use the domain by assigning their own DNS servers. Rental agreements include priority rights to buy the domain during the rental period, with the purchase price fixed in the contract; agreements can last up to 50 months. The site provides online ordering, a downloadable domain list, and support through its Help section and online chat. Customers can also contact the marketplace to ask questions or propose a price for a particular domain.