SITE.su is an online marketplace specializing in premium domain names, including keyword-focused domains and websites. The store lists more than 39,000 domain names, with the site also describing its selection as over 40,000. Listings include domains in the .ru, .su and .рф zones, and customers can browse, search by words or topics, or use advanced search options to find a suitable name. Full domain lists are available to view or download as an Excel file.

Customers can purchase domains online or rent them by the month. A purchase transfers the rights to administer the domain, while rental allows the customer to assign their own DNS servers. Rental agreements provide a priority right to buy the domain during the rental period, with the purchase price set in the contract; agreements can last up to 50 months. The site offers instant online transactions and provides a help section with contacts and online chat. Visitors can also ask questions about a listing or propose a price.