SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains listed across the .ru, .su, and .рф zones. The service enables customers to purchase a domain or rent it by the month, offering options for businesses and individuals seeking a name for an online project. Purchases are completed online with immediate transfer of domain administration rights. For rentals, customers can assign their own DNS servers, and the rental agreement provides a priority right to buy the domain during the contract period at a price fixed in advance. Contracts can run for up to 50 months.

The marketplace provides search tools for finding domains by keyword, including names that match, begin with, or contain a search term, as well as translated and transliterated options. Visitors can view or download the full domain catalogue, review listing details such as price and age, and contact the seller to ask a question or propose an offer. SITE.su also provides a help section and online chat for customer assistance.