SITE.su is an online marketplace for premium domain names, offering a selection of more than 40,000 domains in the .ru, .su and .рф zones. The service helps individuals and businesses find an internet address, with listings that include keyword domains, related terms and transliterations. Customers can browse the full catalogue, download a domain list in Excel, or use advanced search to explore options. Each listing provides information such as purchase and monthly rental prices, and some include age and search or ranking statistics.

SITE.su offers two ways to secure a domain: customers can purchase one online, with immediate transfer, or rent it by assigning their own DNS servers. Rental agreements may include a guaranteed right to buy the domain. The marketplace also supports enquiries and price offers, allowing prospective customers to ask questions or negotiate. Contact information and online chat are available through the help section, while account registration and sign-in enable customers to use the service.