SITE.su operates an online marketplace for premium domain names, offering more than 40,000 domains in the .ru, .su and .рф extensions. The service lets customers browse, search and compare available names, including keyword domains and related names, using filters or downloadable domain lists. Listings show purchase and monthly rental prices, with additional information such as domain age and selected rating or search metrics.

Customers can buy a domain online, with immediate transfer, or rent one by assigning their own DNS servers. The marketplace also offers rental with a guaranteed right to purchase, providing a route from temporary use to ownership. Buyers can place an order through the site, while those who want to negotiate or ask about a specific domain can contact the seller through a question form; email and phone details are requested. Help and online chat are available in the support section, and account access is provided for registration and sign-in.