SITE.su is an online marketplace specializing in premium domain names, with a catalog of more than 39,000 domains, including keyword-focused names in the .ru, .su, and .рф zones. Customers can purchase a domain online or rent it by the month. Purchases include an immediate transfer of domain administration rights, while rental gives the customer permission to set the domain’s DNS servers. Rental agreements provide a priority right to buy the domain during the rental period, with the purchase price fixed in the contract; agreements may run for up to 50 months.

The marketplace helps visitors find suitable names through keyword searches, advanced search filters, and lists of related domains, including names based on synonyms, translations, and transliterations. Users can view or download the full domain catalog, with available data such as age and search-related ratings. SITE.su also provides a help section, online chat, and a form for questions or price offers.