SITE.su is an online marketplace for premium domain names, offering more than 40,000 domains, including keyword-based names in the .ru, .su, and .рф zones. Customers can browse listings, search by words or other parameters, view domain information, and download the full catalogue as an Excel file. Domains are available for immediate online purchase or monthly rental, with prices and listing details shown on the site.

A purchase transfers the rights to administer the domain. Rental allows the customer to assign their own DNS servers and includes a contractual priority right to buy the domain during the rental period, with the purchase price fixed in the agreement. Rental contracts can last up to 50 months. The marketplace also provides a way to ask questions about a domain or propose a price, alongside help, contact information, and online chat. Its listings include details such as domain age and search-related indicators, helping customers assess options for business or personal web projects.