SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains in the .ru, .su, and .рф zones. The service is designed for individuals, businesses, and project owners seeking a domain for their online presence, with options to purchase or rent names directly through the website.

Purchases are completed online, with domain administration rights transferred immediately. For rentals, customers can assign their own name servers, and rental agreements include a priority right to buy the domain during the agreement period, at a price fixed in the contract. The site states that rental agreements can last up to 50 months.

Customers can browse suggested domains, search by words or parameters, view a full domain list, and download catalog data in Excel format. Listings include purchase and monthly rental prices, along with information such as domain age and search-related indicators. SITE.su also provides a help section, online chat, and a contact form where customers can ask questions about a domain or propose a price.