SITE.su is an online marketplace specializing in premium domain names, with more than 40,000 domains offered for purchase or rent. Its listings focus on the .ru, .su, and .рф extensions and include keyword-based names, transliterations, and domains related to a range of topics. Visitors can browse the full catalog, search by terms or parameters, and download a complete domain list for review.

The marketplace offers two ways to obtain a domain. Buyers can complete an online purchase, with administration rights transferred promptly. Renters pay a monthly fee and can use the domain by assigning their own DNS servers. Rental agreements include a priority right to purchase the domain, with the buyout price set in the contract; agreements can last up to 50 months.

SITE.su also provides listing details such as purchase and rental prices, domain age, and search-related indicators. Customers can ask questions about a domain or propose a price through the site, with contact and online chat options available in the Help section.