SITE.su is an online marketplace specializing in premium domain names, with a catalogue of more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service enables customers to purchase a domain or rent it, offering options for businesses and individuals seeking a suitable name for a website or online project. Purchases are 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 during the contract term, with the purchase price fixed in advance. Contracts can run for up to 50 months.

Customers can browse the full domain list, download catalogue data, or use advanced search to find names by keyword and other criteria. Listings show purchase and monthly rental prices, along with details such as domain age and search-related indicators. The marketplace also provides a contact form for questions or price offers, plus help and online chat.