SITE.su is an online marketplace specializing in premium domain names, with a catalogue of more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service enables customers to buy domains online or rent them by assigning their own DNS servers. Purchases include an online transfer of domain administration rights, while rental agreements provide a priority right to buy the domain during the rental period, with the purchase price set in the contract.

The marketplace features keyword-based domain names, Russian-language names, and transliterations, with listings that show purchase and monthly rental prices. Visitors can search by one or more terms, use advanced search filters, browse or download the full domain list, and review available information such as domain age and search-related ratings. Customers can also contact the seller through an online chat or inquiry form to ask questions or propose a price. SITE.su offers a straightforward way for businesses and projects to find, rent, or acquire a domain name suited to their online presence.