SITE.su is an online marketplace specializing in premium domain names, including keyword-based domains in the .ru, .su, and .рф zones. The site offers a catalogue of more than 40,000 domains, with listings that can be explored through search tools, a full downloadable list, and domain details such as price, age, and search-related indicators.

Customers can purchase a domain online, with administration rights transferred after purchase, or rent it by arranging for their own name servers to be assigned. Rental is priced by the calendar month and includes a priority right to buy the domain during the agreement; the purchase price is fixed in the contract, and rental agreements can last up to 50 months. The marketplace also invites visitors to ask questions or propose a price, and provides help and online chat through its support section. SITE.su presents its services as a way for businesses and other projects to find a distinctive web address, with domain options spanning Latin-script and Cyrillic names.