SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains for purchase or rental. Its listings focus on keyword-rich web addresses in the .ru, .su, and .рф zones, with options ranging from Latin-script names to Russian-language domains and transliterations. 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, giving customers a way to use a domain before committing to a full acquisition.

The marketplace provides tools to browse the complete catalogue, download domain lists in Excel, and search using multiple words or parameters. Listings show purchase and monthly rental prices, and selected entries include information such as domain age, ratings, and search statistics. Buyers can use the online cart for immediate transactions, while those seeking different terms can submit a question or price offer through the site. SITE.su also directs visitors to its Help section for contact details and online chat.