SITE.su is an online marketplace specializing in premium domain names, with more than 39,000 listings across 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 web address for an online project. Purchases can be completed online, with domain administration rights transferred immediately. Rental arrangements allow customers to assign their own DNS servers and include a contractual priority right to buy the domain during the rental period. The purchase price is fixed in the rental agreement, which can last up to 50 months.

Visitors can search listings by one or more keywords, use advanced search filters, view domains matching a chosen term, and download the full catalogue as an Excel file. Listings may include purchase and monthly rental prices, domain age, and an SEO-oriented rating based on stated search data. Customers can contact the marketplace through its help section or online chat, ask questions about a domain, and submit a price offer.