SITE.su is an online marketplace specializing in premium domain names for businesses, websites, and other online projects. Its catalog features around 40,000 domain names, including keyword domains and options in the .ru, .su, and .рф extensions. Visitors can browse available names, search by words or other criteria, and review listings with purchase and rental prices, along with details such as domain age and selected rating indicators.

The marketplace offers two ways to secure a domain: immediate online purchase, with the domain transferred promptly, or rental, which can include a guaranteed right to buy later. Customers can place an order directly through the site or contact the seller to ask a question or propose a price. SITE.su also provides a full domain list for browsing or download in Excel format, helping users compare options outside the website. Assistance and online chat are available through the Help section, and account access supports registration and sign-in. Its services are designed to make finding, evaluating, purchasing, or renting a domain straightforward.