SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 keyword-focused domains in the .ru, .su, and .рф zones. The service enables individuals and businesses to buy a domain or rent it by the month, with online purchasing and immediate transfer of domain administration rights. For rentals, customers can assign their own DNS servers, and the rental agreement provides a priority right to purchase the domain during the contract period. The buyout price is fixed in the agreement, which can run for up to 50 months.

Visitors can search the catalog by words or other parameters, view domain details and listed purchase or rental prices, and download the full inventory as an Excel file. The marketplace also invites customers to ask questions or propose a price for a particular domain, with contact options and online chat available through its help section. SITE.su presents domain age and a rating based on search-related data to help users compare listings.