SITE.su is an online marketplace specializing in premium domain names, with a catalog of around 40,000 listings across the .ru, .su, and .рф extensions. The service helps businesses, entrepreneurs, and online project owners find keyword-rich domains suited to their brands and ideas. Customers can purchase a domain online for immediate transfer or rent one by assigning their own DNS servers. Rental agreements include a guaranteed right to buy, offering a way to use a domain before committing to ownership.

The marketplace provides tools to browse the full inventory, search by words or themes, and filter listings through an advanced search. Visitors can also download domain lists, review details such as prices, age, and listed ratings, and explore related names, synonyms, or translations. A shopping cart supports both purchase and rental, while an online inquiry option lets customers ask questions or propose a price. Registration, help resources, and contact options are available through the site, making SITE.su a practical marketplace for acquiring or leasing domain names.