SITE.su is an online marketplace specializing in premium domain names, offering customers a catalog of approximately 40,000 domains, primarily in the .ru, .su, and .рф zones. The service enables individuals and businesses to find keyword-based domain names and purchase or rent them online. Purchases are completed with an immediate transfer of domain administration rights, while rentals allow customers to use a domain by assigning 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; rental terms may last up to 50 months.

Customers can search by keyword or use advanced search options, browse the full domain list, and download a spreadsheet of available names. Listings provide purchase and monthly rental prices, alongside details such as domain age and search-related indicators. SITE.su also offers a way to ask questions or propose a price through its contact form, with support and online chat available in the help section.