SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains across the .ru, .su, and .рф zones. The service helps individuals and businesses find keyword-based domain names for websites, brands, and online projects, with listings available to browse and search by terms or other criteria.

Customers can purchase domains online, with immediate transfer, or rent them by assigning their own DNS servers. The marketplace also offers rental with a guaranteed right to buy, giving customers a way to use a domain before purchasing it. Each listing displays pricing for purchase and rental, and some include details such as domain age and search-related statistics.

SITE.su provides tools to view or download the full domain inventory, including an Excel export, and offers help, contacts, and online chat. Customers can also ask questions about a domain or propose a different price. The catalog includes both Latin-script and Cyrillic domain names, with individual listings such as prichastie.ru.