SITE.SU is an online marketplace for premium domain names, offering more than 40,000 domains in the .ru, .su and .рф zones. The service helps individuals and businesses find and secure domain names for websites, brands and online projects. Customers can purchase domains online with immediate transfer or rent them by assigning their own DNS servers. Rental agreements may include a guaranteed right to buy the domain later.

The marketplace provides tools to browse the full domain catalogue, search by keywords or other parameters, and download domain lists, including data on indicators such as age and ratings. Listings show purchase prices and monthly rental rates, while customers can submit questions or propose a price through the site. A shopping cart supports both purchase and rental requests, and account registration and sign-in are available online. SITE.SU also provides a help section with contact information and online chat. Its catalogue includes keyword-based names and domains in multiple spellings, giving users a range of options for establishing an online presence.