SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains offered for purchase or rent. Its listings include names in the .ru, .su and .рф zones, including keyword-based and transliterated domains. Customers can buy a domain online, with administration rights transferred, or rent it by assigning their own DNS servers. Rental agreements include a priority right to purchase the domain during the rental period, with the buyout price fixed in the contract; the maximum agreement term is 50 months.

The marketplace supports browsing a full domain list, downloading listings in Excel, and searching by keywords or other parameters. Listings may show purchase and monthly rental prices, domain age, and indicators such as search statistics and an SEO-oriented rating. Buyers can use the online cart for an immediate purchase or rental, or contact the seller to ask a question or propose a price. Help, contact information and online chat are available through the site, which also features articles and reviews.