SITE.su is an online marketplace specializing in premium domain names, with a catalogue of more than 40,000 domains, including keyword-focused names in the .ru, .su, and .рф zones. The service offers both outright purchases and monthly rentals, helping customers find a domain for a business, brand, or online project. Purchases can be completed online, with domain administration rights transferred immediately. For rentals, customers can assign their own DNS servers; rental agreements include a priority right to buy the domain, with the purchase price fixed in the contract. Rental terms can run for up to 50 months.

Visitors can search by keyword or use advanced search options, view domain details and pricing, and download the full catalogue as an Excel file. The listings may include domain age and indicators of search interest and SEO appeal. Customers can contact the marketplace through its Help section or online chat, ask questions about a specific domain, and submit a proposed price.