SITE.su is an online marketplace specializing in premium domain names for businesses, websites, and other online projects. Its catalog lists more than 40,000 domains, primarily in the .ru, .su, and .рф zones, with options available for immediate purchase or rental. Buyers can complete purchases online, with domains transferred immediately, while rental customers use the domain by assigning their own DNS servers. The site also offers rentals with a guaranteed right to buy, giving customers a path to ownership.

Visitors can search by keywords, themes, and other parameters, explore related names and domain variations, or browse and download the full catalog as an Excel file. Listings include purchase and monthly rental prices, and may show details such as domain age and search-related statistics. For customers interested in negotiating, SITE.su provides a way to ask a question or propose a price for a specific domain. The website also offers account access, help information, and an online chat for assistance.