SITE.su is an online marketplace specializing in premium domain names for businesses and digital projects. Its catalog includes more than 40,000 domains, primarily in the .ru, .su, and .рф zones, with keyword-based names available for purchase or rent. The service supports online purchases with immediate transfer of domain administration rights, while rental lets customers use a domain by assigning their own DNS servers.

Rental agreements include a priority right to purchase the domain during the rental period, with the buyout price fixed in the contract. Agreements can last up to 50 months. Customers can browse the full domain list, use advanced search filters, or download catalog data in Excel format. Listings provide details such as purchase and monthly rental prices, domain age, and indicators intended to show search appeal. SITE.su also offers assistance through its help section and online chat, and customers can send questions or propose a price for a domain. The marketplace is designed to help users find and secure memorable domain names for their online presence.