SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains available across the .ru, .su, and .рф zones. The service is designed for individuals and businesses seeking memorable, keyword-focused names, offering both immediate purchase and rental options. Customers can browse suggested domains, search by words or topics, use advanced search filters, or view and download the full catalog, including listings with domain metrics.

Purchases are completed online, with domains transferred immediately. For rentals, customers can assign their own DNS servers, and selected offers include a guaranteed right to buy the domain later. Each listing displays pricing and may include details such as domain age and search or rating indicators. Buyers can also contact the marketplace to ask questions or propose a price, with support and online chat available through the Help section. The site provides account registration and login, along with a shopping-cart process for purchasing or renting. Its catalog includes Latin-script and Cyrillic names, synonyms, translations, and domains suited to a variety of themes.