SITE.su is an online marketplace specializing in premium domain names, offering customers a catalog of more than 40,000 domains across the .ru, .su, and .рф zones. The service is designed for individuals and businesses seeking a suitable name for a website, brand, or online project. Customers can purchase domains online with immediate transfer or rent them by assigning their own DNS servers. Rental agreements include a guaranteed right to buy the domain, according to the site.

The marketplace provides search tools for finding domains by keyword, transliteration, or other criteria. Visitors can browse the full catalog, download domain listings in Excel format, and view details such as prices, domain age, and reported ratings or search statistics. A shopping cart supports both purchase and rental, while a question form lets customers ask about a specific name or propose a price. Help resources, contact details, and online chat are also available. The featured listing, proezdi.ru, is presented with separate purchase and monthly rental prices, alongside related domain suggestions.