SITE.su is an online marketplace for premium domain names, offering a catalogue of more than 39,000 domains, with listings across the .ru, .su, and .рф zones. Customers can browse domains that match specific words, explore related or transliterated names, and use advanced search tools to find options for a business, website, or online project. The full catalogue can also be viewed or downloaded as a spreadsheet.

The marketplace supports both domain purchases and rentals. Purchases are completed online, with domain administration rights transferred immediately. For rentals, customers can assign their own DNS servers; the monthly agreement includes a priority right to buy the domain, with the purchase price fixed in the contract. Rental agreements can last up to 50 months. Listings show prices and may include domain age and search-related indicators to help customers compare options. SITE.su also provides a help section and online chat, and visitors can ask questions about a domain or propose a price.