SITE.su is an online marketplace specializing in premium domain names, with a catalog of more than 40,000 listings across the .ru, .su, and .рф domains. The service helps businesses and individuals find keyword-focused domain names for websites, online projects, and other digital ventures. Listings can be browsed through an expanded search, matched by spelling or related terms, or explored using downloadable catalog files.

Customers can purchase domains online, with immediate transfer, or rent them by assigning their own DNS servers. Rental options may include a guaranteed right to buy, offering a way to use a domain before committing to ownership. Each listing displays pricing for purchase and monthly rental, and some include details such as domain age and search-related statistics. Customers can also submit questions about a specific name or propose a price, with contact and online chat available through the help section. SITE.su presents itself as a practical marketplace for comparing and acquiring domain names in popular Russian-language extensions.