SITE.su is an online marketplace specializing in premium domain names, with a catalog of more than 40,000 domains in the .ru, .su, and .рф zones. The service enables customers to buy domains or rent them, offering options for businesses, entrepreneurs, and others seeking a suitable web address. Its listings include keyword-based names and related domain variants, with details such as purchase and monthly rental prices, registration age, and search-related indicators.

Customers can complete an immediate online purchase, which transfers domain administration rights, or rent a domain by assigning their own name servers. Rental agreements include a priority right to purchase the domain during the rental term, with the buyout price set in the contract; agreements can last up to 50 months. The marketplace provides search tools, an expanded search function, and downloadable domain lists, including spreadsheet exports. Visitors can also ask questions or propose a price through the site, with contact and online chat options available in its Help section. Aerodromi.ru is one example of a listed domain.