SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service helps businesses, entrepreneurs, and other buyers find web addresses for websites, brands, and projects, with listings searchable by name and other parameters.

Customers can purchase domains online with immediate transfer or rent them by assigning their own DNS servers. Rental listings include an option to secure the right to buy the domain, and buyers can contact the marketplace to ask questions or propose a price. The site also provides tools to browse the full domain catalog, download listings in Excel, and review information such as domain age and selected traffic or search metrics where available.

SITE.su presents domain details alongside purchase and monthly rental prices, allowing visitors to compare options before deciding. Its offering includes both Latin-script names and Cyrillic domains, with examples spanning a wide range of words and themes.