SITE.su is an online marketplace specializing in premium domain names, with listings across the .ru, .su, and .рф extensions. The store offers a catalogue of around 40,000 domains, including keyword-based names, translated terms, and related or synonymous options. Customers can purchase a domain online with immediate transfer or rent it by directing their DNS servers to their own hosting. Rental options include a guaranteed right to buy the domain, giving customers a way to use a name before committing to ownership.

The site provides tools to browse the full catalogue, search by words or other parameters, and download domain lists in Excel format. Listings show purchase and monthly rental prices, and may include information such as domain age and ratings. Customers can submit questions about a specific name or propose a price, with support and online chat available through the Help section. The marketplace is designed for individuals and businesses seeking a memorable web address for a personal brand, website, or other online project.