SITE.su is an online marketplace specializing in premium domain names, with a catalogue of around 40,000 domains across the .ru, .su, and .рф zones. The service helps businesses and individuals find web addresses that match a name, keyword, or topic, offering both immediate purchase and rental options. Buyers can purchase domains online, with administration rights transferred upon sale. Rental is offered by the calendar month and includes the renter’s right to buy the domain during the agreement; the purchase price is fixed in the contract, which can run for up to 50 months. Rental allows customers to change the domain’s name server settings.

The marketplace provides search tools for matching, similar, and transliterated domain names, as well as an expanded search, downloadable domain lists, and listings with details such as age and search-related indicators. Customers can submit a question or offer a price for a domain, and the site provides help and online chat through its support section.