SITE.su is an online marketplace for domain names, offering a large catalog of keyword-focused domains in the .ru, .su, and .рф zones. The site describes its selection as containing around 39,000 to more than 40,000 domains, available for either purchase or rental. Buyers can complete a purchase online, with domain administration rights transferred immediately. Rental provides the customer with the ability to set the domain’s name server addresses and includes a contractual priority right to buy the domain during the rental period; the purchase price is fixed in the agreement. Rental terms can last up to 50 months.

The marketplace helps visitors explore available names through keyword searches, synonym and transliteration suggestions, and an extended search by parameters. Customers can view or download the full domain list, including spreadsheet data, and contact the store through its help section or online chat to ask questions or propose a price. Listings may include domain age and indicators of search-related performance.