SITE.su operates 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, transliterated, and related domain names for websites and online projects. Customers can purchase a domain outright or rent it, with rental options that include a guaranteed right to buy. Purchases are completed online with immediate domain transfer, while rental is arranged by assigning the customer’s DNS servers.

The marketplace provides search tools for exploring domains by word or theme, an advanced search, and downloadable listings, including spreadsheet exports with domain metrics. Listings display purchase and monthly rental prices, along with available information such as domain age, ratings, and search statistics. Customers can use an online cart for immediate transactions or contact the seller to ask questions and propose a price. SITE.su also offers registration and login functions, plus help, contact details, and online chat.