SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains primarily in the .ru, .su and .рф zones. The service is designed for businesses, entrepreneurs and project owners seeking a memorable web address, including keyword-based domains. Customers can purchase a domain online, with ownership administration transferred instantly, or rent one by assigning their own DNS servers.

Rental listings show a monthly price, and the rental agreement gives the customer priority rights to buy the domain during the contract term, with the purchase price fixed in the agreement. Contracts can run for up to 50 months. The marketplace provides tools to browse the full domain catalogue, search by terms or other parameters, and download listings in Excel. Each listing may include purchase and rental prices, domain age and indicators related to search visibility. Customers can submit questions or offers for a domain, and the site directs them to its Help section for contact information and online chat.