SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains in the .ru, .su, and .рф zones. The service helps individuals and businesses find and secure domain names, including keyword-based options, through online purchase or rental. Buyers can complete a purchase online, with domain administration rights transferred immediately. Rental is offered by the month and allows customers to assign their own DNS servers. Rental agreements include a priority right to buy the domain during the rental period, with the purchase price fixed in the contract; agreements can run for up to 50 months.

Customers can browse the full domain list, download a spreadsheet, or use advanced search to explore available names. Listings may show purchase and monthly rental prices, domain age, and a rating based on search and keyword indicators. For a particular domain, visitors can submit a question or proposed price through the site.