SITE.su is an online marketplace specializing in premium keyword domain names, with more than 40,000 domains available across the .ru, .su and .рф extensions. The service helps individuals and businesses find memorable web addresses for their online projects, including names related to health, medicine and treatment. Customers can purchase domains online, with administration rights transferred immediately, or rent them by setting their own DNS server addresses. Rental agreements include a priority right to buy the domain during the rental term, with the purchase price fixed in the contract; agreements may last up to 50 months.

The marketplace offers instant purchase and rental options, an expanded search, and downloadable domain listings in Excel. Listings include pricing and may show information such as domain age and ratings. Customers can ask questions about a domain or submit a price offer through the site, with support and online chat available in the Help section.