SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains available across the .ru, .su, and .рф zones. The service helps individuals and businesses find domain names for websites, blogs, and other online projects, including keyword-based options. Customers can browse the full catalogue, search by terms or other criteria, view domain details, or download a list for review.

Domains are available for immediate purchase or monthly rental. A purchase transfers domain administration rights online, while renting lets customers assign their own name servers. Rental agreements include priority rights to buy the domain during the rental period, with the purchase price fixed in the contract; agreements can last up to 50 months. The site also provides domain information such as age and search-related metrics, and allows customers to ask questions or propose a price. Support and online chat are available through the Help section.