SITE.su is an online marketplace specializing in premium domain names, offering a selection of more than 40,000 domains across the .ru, .su, and .рф zones. The service enables individuals and businesses to find keyword-based domain names for websites, brands, and online projects, with listings searchable by terms and other parameters. Customers can browse or download the full domain catalog and review information such as purchase and monthly rental prices, domain age, and search-related indicators.

Domains are available for immediate purchase, with administration rights transferred online, or for rent through the assignment of the customer’s DNS servers. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the contract; agreements can last up to 50 months. The marketplace also provides a way to ask questions about a domain or submit a price offer, alongside assistance and online chat through its help section.