SITE.su is an online marketplace specializing in premium domain names, with approximately 40,000 domains available across the .ru, .su, and .рф zones. The service enables customers to purchase a domain outright or rent it by the month, offering options for businesses and individuals at different stages of developing an online project. Purchases are completed online with the domain transferred to the buyer, while rentals allow customers to use the domain by assigning their own DNS servers. Rental agreements include a priority right to purchase the domain, with the buyout price fixed in the contract; agreements can last up to 50 months.

The marketplace provides tools to search by keywords and other parameters, browse the full domain inventory, and download listings in Excel format. Customers can also ask questions about specific names or propose a price, with contacts and online chat available through the help section. Domain listings include purchase and monthly rental prices, alongside information such as domain age and search-related indicators to support evaluation.