SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 listings across the .ru, .su, and .рф extensions. The service helps businesses and individuals find domain names for websites, brands, and personal projects, offering options that include keyword domains and names with Latin or Cyrillic spellings.

Customers can purchase domains online for immediate transfer or rent them by assigning their own DNS servers. Rental arrangements include a guaranteed right to buy the domain, giving users a way to begin using a name before committing to a purchase. Listings show purchase and monthly rental prices, and some include details such as domain age and search or ranking statistics.

The marketplace provides search tools for exploring names by keyword or other criteria, as well as downloadable domain lists in Excel format. Buyers can add domains to a cart for immediate purchase or rental, and can contact the seller to ask questions or propose a price. Support and online chat are available through the Help section.