SITE.su is an online marketplace specializing in domain names, with a catalog of more than 40,000 domains, primarily in the .ru, .su and .рф zones. The service is designed for individuals and businesses seeking a distinctive web address for a project, website or online presence. Customers can buy domains online with immediate transfer or rent them by assigning their own DNS servers. Rental agreements include a guaranteed right to purchase, offering a route from temporary use to ownership.

The marketplace provides tools to browse its listings, including an expanded search, a downloadable domain catalog and options to view names related by spelling, transliteration or translation. Listings show purchase and monthly rental prices, and may include details such as domain age and search-related statistics. Customers can add a domain to a cart for an immediate transaction or contact the seller with a question or price offer. SITE.su also provides help and online chat through its support section, along with account access for users who wish to register or sign in.