SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 listings across the .ru, .su, and .рф domains. The service helps businesses and individuals find a domain for a website, brand, or personal project, offering both immediate purchase and rental. Buyers can complete an online purchase with instant domain transfer, while rental allows them to use a domain by assigning their own DNS servers. Some rental arrangements also include a guaranteed right to buy the domain later.

The marketplace provides tools to explore its inventory, including a full domain list, an Excel download, and advanced search by keywords or other parameters. Listings show prices for purchase and monthly rental, and may include domain age and ranking information. Customers can add a domain to a cart for purchase or rental, or contact the seller to ask a question or propose a different price. Help, contact details, and online chat are available through the site.