SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service helps businesses and individuals find keyword-based domain names for websites and other online projects, with search tools for browsing by words, topics, and other criteria. Customers can view domain details and prices, explore the full inventory, or download a list for review.

Domains are available for immediate online purchase or rental. A purchase transfers the rights to administer the domain, while rental allows the customer to use it by assigning their own name servers. Rental agreements include a priority right to buy the domain during the contract period, with the purchase price fixed in advance; contracts can run for up to 50 months. The marketplace also provides a way to ask questions or propose a price, along with account access and online support through its Help section. Domain listings include information such as age, price, and SEO-related indicators to support comparison.