SITE.su is an online marketplace for buying and renting domain names, with a catalogue of around 40,000 domains in the .ru, .su, and .рф zones. The service is designed for businesses, project owners, and individuals seeking a domain for their online presence. Customers can browse the full catalogue, search by keywords or other criteria, and review listed prices and available domain information.

Domains can be purchased online, with transfer of administrative rights, or rented by the month. Rental agreements provide the renter with priority rights to buy the domain during the agreement and set the purchase price in advance; the stated maximum rental term is 50 months. Rental also allows customers to assign their own name servers. The site offers downloadable domain listings, including a spreadsheet, and provides a contact form and online chat through its help section. For selected domains, visitors can submit questions or propose a price. SITE.su presents domain details such as age and search-related indicators to help users compare options.